Downloaded 29 times
![Grep on PHP code
1318 reports
doc/_ext/configext.py: parts = text.split("']['")
js/codemirror/lib/codemirror.js: var change = {from: pos, to: p
po/zh_CN.po:"example: address can be split into stre
libraries/Advisor.php: public static function splitJu
libraries/plugins/ImportCsv.php: $tmp = preg_split('/,( ?)/', $
libraries/Config.php: // split file to lines](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-36-2048.jpg)
![8.506s 3 results 27 analysis
php ~/.composer/vendor/bin/php7cc library/
File: /Users/famille/Desktop/analyze/library/Analyzer/Analyzer.php
> Line 231: Function argument(s) returned by "func_get_args" might have been modified
func_get_args();
File: /Users/famille/Desktop/analyze/library/Analyzer/Functions/MarkCallable.php
> Line 32: Nested by-reference foreach loop, make sure there is no iteration over the same array
foreach ($lists as $id => &$function) {
}
File: /Users/famille/Desktop/analyze/library/Tasks/Analyze.php
> Line 118: Possible adding to array on the last iteration of a by-reference foreach loop
$dependencies[$v] = $dep;
Checked 873 files in 8.506 seconds](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-42-2048.jpg)
![Preg_replace and /e
preg_replace(‘/ /e’, ‘evaled code’, $haystack)
replaced by
preg_replace_callback_array()
preg_replace(‘/ /e’, ‘evaled code’, $haystack)
preg_replace_callback_array([‘/ /’ => $closure],
$haystack)
preg_replace_callback(‘/ /’,
$closure],
$haystack)](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-64-2048.jpg)
![preg_replace_callback_array
<?php
$code = "abbbb";
$spec = 'c';
echo preg_replace_callback_array(
array(
"/a/" => function($matches) {
return strtoupper($matches[0]);
},
"/b/" => function($matches) use ($spec) {
static $i = 0;
$i++;
return "B$i$spec";
}
), $code);
AB1cB2cB3cB4c](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-65-2048.jpg)
![Negative string offset (7.1)
<?php
$string = "abcde";
print $string[-3];
print "$string[3]";
print "$string[-2]";
c
d
d](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-89-2048.jpg)
![list() with keys
Upgraded to Fatal error
<?php
$array = ['a' => 1, 'b' => 5, 'c' => 3];
// Assigns to $a, $b and $c in the same order
list($a, $b, $c) = array_values($array);
// Assigns to $a, $b and $c from the keys
//"a", "b" and "c", respectively
list("a" => $a, "c" => $c, "b" => $b) = $array;
list("a" => $a, "b" => $b, "c" => $c) = $array;
list("c" => $c, "a" => $a, "b" => $b) = $array;](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-90-2048.jpg)
![list() with keys
<?php
$array = ['b' => 5, 'a' => 1, 'c' => 3];
ksort($array);
$array = array_values($array);
// Assigns to $a, $b and $c in the same order
list($a, $b, $c) = $array;
// SELECT id, * FROM users
list($userId, $name, $last) = array_values($row);](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-91-2048.jpg)
![Short syntax for list()
<?php
$array = ['a' => 1, 'b' => 5, 'c' => 3];
["a" => $b, "c" => $c, "b" => $a] = $array;
// Works even when nested
$array = [['a' => 1, 'b' => 5], ['c' => 3]];
[["a" => $a, "b" => $b], ["c" => $c]] = $array;](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-92-2048.jpg)
![func_get_arg()
func_get_arg() and func_get_args() now return
the current argument values
<?php
function foo($a, $b, $c) {
print_r(func_get_args());
++$a;
print_r(func_get_args());
}
foo(1,2,3);
Array
(
[0] => 1
[1] => 2
[2] => 3
)
Array
(
[0] => 2
[1] => 2
[2] => 3
)](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-99-2048.jpg)
![Usort()
<?php
$array = array(
'foo',
'bar',
'php'
);
usort($array, function($a, $b) {
return 0;
}
);
print_r($array);
Array
(
[0] => php
[1] => bar
[2] => foo
)
Array
(
[0] => foo
[1] => bar
[2] => php
)
PHP 5
PHP 7](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-100-2048.jpg)
![Don't hide in parentheses
<?php
function getArray() {
return [1, 2, 3];
}
function squareArray(array &$a) {
foreach ($a as &$v) {
$v **= 2;
}
}
// Generates a warning in PHP 7.
squareArray((getArray()));
?>
Parenthesis in
arguments won't
mask error
anymore](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-106-2048.jpg)
![Constant arrays
Lots of properties could be turned to constants
<?php
class Version {
const SUPPORTED = ['1.0', '1.1', '2.0', '2.1'];
private $an_array = [1,2,3,4];
public function isSupported($x) {
return isset(Version::SUPPORTED[$x]);
}
}](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-107-2048.jpg)
![Constant arrays
Lots of properties could be turned to constants
<?php
class Version {
const SUPPORTED = ['1.0', '1.1', '2.0', '2.1'];
private $an_array = [1,2,3,4];
public function isSupported($x) {
return isset(Version::SUPPORTED[$x]);
}
}](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-109-2048.jpg)
![Foreach update the actual
array
<?php
$array = [0];
foreach ($array as $k => &$val) {
print "$kn";
$array[] = 1;
// Only for pushing, not unshifting
}
0
1
2
3
4
5
6
7
8
9
10
11
0](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-111-2048.jpg)
![Array/Object casting
<?php
$arr = [0 => 1, 1 => 2, 2 => 3];
$obj = (object)$arr;
// PHP 7.1
echo $obj->{"0"};
// PHP 7.2
echo $obj->{0};
7.2](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-112-2048.jpg)
![session_start($options)
Very Cute <=>
Replaces a lot of code
Mainly useful for usort()
<?php
// PHP 5.6
ini_set('session.name','session');
ini_set('session.gc_probability',1);
ini_set('session.gc_divisor',1);
session_start();
// PHP 7.0
session_start(['name' => 'session',
'gc_probability' => 1,
'gc_divisor' => 1 ]
);](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-117-2048.jpg)
![Null-coalesce
Shorter way to give a test for NULL and failover
<?php
// PHP 5.6
$x = $_GET['x'] === null ? 'default' : $_GET['x'];
// PHP 7.0
$x = $_GET['x'] ?? 'default';
?>](https://image.slidesharecdn.com/lasttraintophp7-170220084231/75/Last-train-to-php-7-121-2048.jpg)
Uploaded byDamien Seguy
Last train to php 7
The document discusses the migration challenges and considerations when upgrading to PHP 7.2, highlighting backward incompatibilities and new features. It emphasizes the importance of tools and methods such as static code analysis, linting, and thorough code reviews for successful migration. Additionally, it provides resources, examples, and recommendations for finding and fixing issues in code during the upgrade process.
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Last train to php 7
- 1. Last Train toPHP 7.1 Damien Seguy @exakat London, United Kingdom, February 2017
- 2. Full ahead toPHP 7. 2 Changing version is always a big challenge Backward incompatibilities New features Learn, spot, fix, repeat 01
- 3. Speaker Damien Seguy CTO atexakat Static code analysis for PHP Retiring house for oldest elephpant
- 4. Synopsis What is inthe next version ? Where in my code ? How to replace this ? Get documentation Find issue Fix code
- 5. Migration to PHP7.2 Migration to PHP 7.0, 7.1 and 7.2 / 8.0 From PHP 5.6 No framework, no libraries Tools, experience, discipline
- 6.
- 7. Living on theedge http://php.net/manual/en/migration71.php Online UPGRADING TO PHP 7.0 Free Book, PDF Davey Shafik is RM for PHP 7.1 Lots of blogs and articles
- 8. Living on thebleeding edge https://github.com/php/php-src/blob/master/UPGRADING https://github.com/php/php-src/blob/master/NEWS https://wiki.php.net/rfc http://bugs.php.net/
- 12.
- 14. Which to believe Books PHPmanual Migration, blogs Wiki (Implemented) NEWS Bugs Wiki (Future) Yearly Monthly Weekly As possible As needed
- 15. Where does codebreak? Checked with phplint Checked with tests Checked code review PHP has 3 phases syntax definitions execution
- 16. <?php function splitNames($fullname, $fullname) { list($first, $last) = split($fullname, ' '); } echo splitNames('John Doe'); ?> Wherewill code break? SyntaxDefinitionsExecution
- 17. Tools for migration •Your own experience with your code • Lint • Search • Static analysis • Logs
- 18.
- 19. PHP linting • commandline : php -l filename.php • Spot parse errors • Works on files only : • For directories, see composer phplint/phplint
- 20. PHP linting Error messages inPHP 0 550 1100 1650 2200 5.0 5.1 5.2 5.3 5.4 5.5 5.6 7.0 7.1 7.2 Total Distinct
- 21. Backward unlintable code 0 1 2 3 4 5.25.3 5.4 5.5 5.6 7.0 7.1 7.2
- 22. Current versions code 0 1.25 2.5 3.75 5 5.25.3 5.4 5.5 5.6 7.0 7.1 7.2
- 23. Backward unlintable code 0 0.25 0.5 0.75 1 5.25.3 5.4 5.5 5.6 7.0 7.1 7.2
- 24. 0 1.25 2.5 3.75 5 5.2 5.3 5.45.5 5.6 7.0 7.1 7.2 0 1 2 3 4 5.2 5.3 5.4 5.5 5.6 7.0 7.1 7.2 0 0.75 1.5 2.25 3 5.2 5.3 5.4 5.5 5.6 7.0 7.1 7.2 0 1.75 3.5 5.25 7 5.2 5.3 5.4 5.5 5.6 7.0 7.1 7.2 0 0.25 0.5 0.75 1 5.2 5.3 5.4 5.5 5.6 7.0 7.1 7.2
- 25. php -l withother versions syntax error, unexpected 'new' (T_NEW) Assigning the return value of new by reference is deprecated (PHP 5.6) PHP 7 -> PHP 5.6 $o =& new Stdclass();
- 26.
- 27. Switch statements mayonly contain one default clause <?php switch($x) { case '1' : break; default : break; default : break; case '2' : break; }
- 28. Switch statements mayonly contain one default clause switch($x) { case 1 : break; case 0+1 : break; case '1' : break; case true : break; case 1.0 : break; case $y : break; }
- 29. Deprecated features Not happeningif a parent case has a __construct() Not happening if the class is in a namespace Use the E_DEPRECATED error level while in DEV Methods with the same name as their class will not be constructors in a future version of PHP; foo has a deprecated constructor
- 30. Migration to PHP7.2 Lint with PHP 7.1 PHP 7.2 (or src) PHP 5.6 (current), PHP 7.0 PHP 5.5, 5.4,… (manual)
- 31. PHP 7 linting Pre-commit Usedifferent versions Be ruthless with unlintable files
- 32. Where does codebreak? Checked with phplint Checked with tests Checked code review PHP has 3 phases syntax definitions execution
- 33.
- 34. Definition Review code withoutexecuting it Audit code by reading it Common in C/C++, Java, Javascript Hot subject to PHP
- 35. GREP/SEARCH Any searching facility Pro: High speed, great for keyword search, universal Cons : Little repeat value, no PHP semantics
- 36. Grep on PHPcode 1318 reports doc/_ext/configext.py: parts = text.split("']['") js/codemirror/lib/codemirror.js: var change = {from: pos, to: p po/zh_CN.po:"example: address can be split into stre libraries/Advisor.php: public static function splitJu libraries/plugins/ImportCsv.php: $tmp = preg_split('/,( ?)/', $ libraries/Config.php: // split file to lines
- 37. Static analysis PHP 5/ 7 Calisthenics ClearPHP Performance
- 38.
- 39. PHP7mar PHP 7 MigrationAssistant Report (MAR) Alexia : https://github.com/Alexia/php7mar Works with regex Produces a .md file
- 40.
- 41. PHP7cc PHP 7 CompatibilityChecker Authored by sstalle https://github.com/sstalle/php7cc PHP 5, works with "nikic/php-parser": "~1.4" Display to stdout
- 42. 8.506s 3 results27 analysis php ~/.composer/vendor/bin/php7cc library/ File: /Users/famille/Desktop/analyze/library/Analyzer/Analyzer.php > Line 231: Function argument(s) returned by "func_get_args" might have been modified func_get_args(); File: /Users/famille/Desktop/analyze/library/Analyzer/Functions/MarkCallable.php > Line 32: Nested by-reference foreach loop, make sure there is no iteration over the same array foreach ($lists as $id => &$function) { } File: /Users/famille/Desktop/analyze/library/Tasks/Analyze.php > Line 118: Possible adding to array on the last iteration of a by-reference foreach loop $dependencies[$v] = $dep; Checked 873 files in 8.506 seconds
- 43. PHAN Static analysis forPHP Inited by Rasmus, under work at Etsy https://github.com/etsy/phan PHP 7 only, with ext/ast php ~/.composer/vendor/bin/phan -f phan.in -3 vendor -o phan.out
- 45. 11.244s 333 results PhanUndeclaredPropertyReference to undeclared property processed PhanUndeclaredProperty Reference to undeclared property stdclass->results PhanNonClassMethodCall Call to method relateTo on non-class type null PhanStaticCallToNonStatic Static call to non-static method loadercypher::saveTokenCounts() defined at libr PhanAccessPropertyProtected Cannot access protected property tokenizertoken::$alternativeEnding PhanTypeMismatchArgument Argument 1 (atom) is string but analyzerstructuresuseconstant::atomfunction PhanUndeclaredClassMethod Call to method __construct from undeclared class reportsxmlwriter PhanUndeclaredVariable Variable $r is undeclared 84 analysis
- 46. Exakat Static analysis enginefor PHP https://github.com/exakat/exakat PHP 5.2 to 7.2; php exakat.phar project -p name
- 47. 20 mins6798 results290analysis
- 48.
- 49. PHP inspections Static analysisengine for within the IDE Vladimir Reznichenko https://bitbucket.org/kalessil/phpinspectionsea Written in Java Runs from within PHPstorm
- 51. Write your own? https://github.com/exakat/php-static-analysis-tools.git PHP7 : use ext/ast PHP 5 :"nikic/php-parser" Better Reflexion Avoid regex (but it does work)
- 52. PHP 7.2 :what changes? Incompatible changes New features Features/Incompatibilities from PHP 5.6 => 7.2
- 53. How to spotissues? Code knowledge lint Grep / Search Static analysis Logs / error_reporting Unit Tests
- 54.
- 55.
- 56.
- 57.
- 58. Removed extensions ext/ereg ereg ereg_replace split sql_regcase Moved utf8_encode()and utf8_decode() to the Standard extension 7.2
- 59. Removed functions call_user_method() call_user_method_array() Repleacable by$funcname Replaced by call_user_func() and call_user_func_array() Partially replaced by variadic png2wbmp() and jpeg2wbmp() Deprecated 7.2
- 60. Removed variables $HTTP_RAW_POST_DATA Replace itby php://input php://input is now reusable Since PHP 5.5
- 61. Removed INI sql.safe_mode (PHP7.2) mbstring.internal_encoding mbstring.http_output mbstring.http_input iconv.internal_encoding iconv.input_encoding iconv.output_encoding default_charset }
- 62. default_charset htmlentities() PHP 5.3 :ISO-8859-1 PHP 5.4 : UTF-8 PHP 5.6 : default_charset (also UTF 8)
- 63. Where to lookfor ? default_charset Search for ini_set(), ini_get(), ini_get_all(), ini_restore(), get_cfg_var() Search in php.ini, .htaccess Search for htmlentities(), html_entity_decode() and htmlspecialchars()
- 64. Preg_replace and /e preg_replace(‘//e’, ‘evaled code’, $haystack) replaced by preg_replace_callback_array() preg_replace(‘/ /e’, ‘evaled code’, $haystack) preg_replace_callback_array([‘/ /’ => $closure], $haystack) preg_replace_callback(‘/ /’, $closure], $haystack)
- 65.
- 66.
- 67. Can't call dynamically! •$func() •call_user_func() •array_map() •orsimilar •assert() with a string argument extract() compact() get_defined_vars() func_get_args() func_get_arg() func_num_args() parse_str() with one argument mb_parse_str() with one argument
- 68.
- 69. Added definitions Functions ClassesConstants 5.3 40 2 80 5.4 0 9 78 5.5 12 11 57 5.6 1 10 10 7.0 10 10 41 7.1 9 3 30 7.2 4 0 15 Total 766 92 1163
- 70. Name impact get_resources(), intdiv(),is_iterable(), mb_scrub() PREG_JIT_STACKLIMIT_ERROR class Date (from PHP 5.1) Error (new class in PHP 7)
- 71.
- 72.
- 73. Invalid octals areinvalid Upgraded from silent to Fatal error PHP Parse error: Invalid numeric literal in test.php <?php $x = 0890;
- 74. More invalid octalsin strings <?php var_dump("000" === "400"); https://wiki.php.net/rfc/octal.overload-checking
- 75. More reserved keywords bool,int, float, string, null, true, false are no more available for class / interface / traits names mixed, numeric, object, resource are reserved for future use void is reserved in 7.1
- 76.
- 77. Strings may beinvalid <?php echo "u{1F418}n"; > php56 test.php u{1F418} > php70 test.php 🐘 <?php echo "u{65B0}u{52A0}u{5761}n"; //
- 78. Strings may beinvalid <?php echo "u{Yes}n"; PHP Parse error: Invalid UTF-8 codepoint escape sequence in test.php on line 3 u{
- 79. Hexadecimal numeric strings Also,-0 !! <?php var_dump(1 + 0xf); var_dump(1 + "0xf"); $ php56 test.php int(16) int(16) $ php70 test.php int(16) int(1)
- 80. Warning for strings(7.1) <?php print "2" + "4"; print "3 elephpants" + "4 dolphins"; print "2" + "d4 d"; 6 7 2 Warning: A non-numeric value encountered
- 81.
- 82. Exceptions Exception is notthe top exception type anymore It is now the 'throwable' interface Impact on Exception handler Avoid type hinting until moved to PHP 7 Impact on Error handler Impact on catch() clauses
- 83.
- 84. More catching exceptions Parsererrors now throw a ParseError object. Error handling for eval() <?php try { $file = new finfo(FILEINFO_NONE,$magic_file); } catch( ParseError $e) { log($e->getMessage()); // attempt to fix this or error handling }
- 85.
- 86. Even more catchingexceptions <?php try { attemptSomething(); } catch (RuntimeException $e) { fixSomething(); } catch (InvalidArgumentException $e) { fixSomething(); } catch (BadFunctioncallException $e) { fixSomething(); }
- 87. Even more catchingexceptions Parser errors now throw a ParseError object. Error handling for eval() <?php try { attemptSomething(); } catch (RuntimeException| InvalidArgumentException| BadFunctioncallException $e) { fixSomething(); }
- 88. Even more catchingexceptions <?php //try really harder try { attemptSomething(); } catch (Exception $e) { attemptSomething(); }
- 89. Negative string offset(7.1) <?php $string = "abcde"; print $string[-3]; print "$string[3]"; print "$string[-2]"; c d d
- 90. list() with keys Upgradedto Fatal error <?php $array = ['a' => 1, 'b' => 5, 'c' => 3]; // Assigns to $a, $b and $c in the same order list($a, $b, $c) = array_values($array); // Assigns to $a, $b and $c from the keys //"a", "b" and "c", respectively list("a" => $a, "c" => $c, "b" => $b) = $array; list("a" => $a, "b" => $b, "c" => $c) = $array; list("c" => $c, "a" => $a, "b" => $b) = $array;
- 91.
- 92. Short syntax forlist() <?php $array = ['a' => 1, 'b' => 5, 'c' => 3]; ["a" => $b, "c" => $c, "b" => $a] = $array; // Works even when nested $array = [['a' => 1, 'b' => 5], ['c' => 3]]; [["a" => $a, "b" => $b], ["c" => $c]] = $array;
- 93. Call-time pass-by-reference References arein the function signature Deprecated warnings until PHP 7 Upgraded to Parse error in PHP 7 <?php $a = 3; function f($b) { $b++; } f(&$a); print $a; ?> PHP Parse error: syntax error, unexpected '&' in …
- 94. Incompatible context <?php class A { function f() { echo get_class($this); } } A::f(); ?> Notice:Undefined variable: $this inA Deprecated: Non-static methodA::f() should not be called statically Notice: Undefined variable: $this inA
- 95. Easy to spot StrictStandards: Non-static method A::f() should not be called statically in test.php on line 6 Deprecated: Non-static method A::f() should not be called statically in test.php on line 6
- 96. $this is forclasses <?php class bar{ function foo($this) { static $this; global $this; foreach ($a as $this) { try { $a = "this"; $$a = 42; } catch (Exception $this) {} } unset($this); } }
- 97.
- 98.
- 99. func_get_arg() func_get_arg() and func_get_args()now return the current argument values <?php function foo($a, $b, $c) { print_r(func_get_args()); ++$a; print_r(func_get_args()); } foo(1,2,3); Array ( [0] => 1 [1] => 2 [2] => 3 ) Array ( [0] => 2 [1] => 2 [2] => 3 )
- 100. Usort() <?php $array = array( 'foo', 'bar', 'php' ); usort($array, function($a, $b) { return 0; } ); print_r($array); Array ( [0] => php [1]=> bar [2] => foo ) Array ( [0] => foo [1] => bar [2] => php ) PHP 5 PHP 7
- 101. Automatically fixed It isnot safe to rely on the system's timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier.
- 102.
- 103. New features Breaks backwardcompatibility sometimes FUD Search for places to apply them like for incompatibilities
- 104.
- 105.
- 106. Don't hide inparentheses <?php function getArray() { return [1, 2, 3]; } function squareArray(array &$a) { foreach ($a as &$v) { $v **= 2; } } // Generates a warning in PHP 7. squareArray((getArray())); ?> Parenthesis in arguments won't mask error anymore
- 107. Constant arrays Lots ofproperties could be turned to constants <?php class Version { const SUPPORTED = ['1.0', '1.1', '2.0', '2.1']; private $an_array = [1,2,3,4]; public function isSupported($x) { return isset(Version::SUPPORTED[$x]); } }
- 108.
- 109. Constant arrays Lots ofproperties could be turned to constants <?php class Version { const SUPPORTED = ['1.0', '1.1', '2.0', '2.1']; private $an_array = [1,2,3,4]; public function isSupported($x) { return isset(Version::SUPPORTED[$x]); } }
- 110.
- 111. Foreach update theactual array <?php $array = [0]; foreach ($array as $k => &$val) { print "$kn"; $array[] = 1; // Only for pushing, not unshifting } 0 1 2 3 4 5 6 7 8 9 10 11 0
- 112. Array/Object casting <?php $arr = [0 => 1, 1 => 2, 2 => 3]; $obj = (object)$arr; // PHP 7.1 echo$obj->{"0"}; // PHP 7.2 echo $obj->{0}; 7.2
- 113.
- 114.
- 115. Closure binding <?php class { private $hello = ""; } $obj = new Hello(); $closure = $obj->makeClosure(); $nihao = new (); $closure2 = $closure->bindTo($nihao); $closure2(); Request the closure from the object
- 116. Closure binding <?php $closure = function() { echo $this->hello; }; class { private $hello = " "; } $nihao = new (); $closure->call($nihao); Bind the object at the last moment
- 117. session_start($options) Very Cute <=> Replacesa lot of code Mainly useful for usort() <?php // PHP 5.6 ini_set('session.name','session'); ini_set('session.gc_probability',1); ini_set('session.gc_divisor',1); session_start(); // PHP 7.0 session_start(['name' => 'session', 'gc_probability' => 1, 'gc_divisor' => 1 ] );
- 118.
- 119. Parameters evolution get_headers() hasan extra parameter Passing a custom stream context getenv() doesn't need parameter all the current environment variables will be returned get_class() doesn't allow null anymore
- 120.
- 121. Null-coalesce Shorter way togive a test for NULL and failover <?php // PHP 5.6 $x = $_GET['x'] === null ? 'default' : $_GET['x']; // PHP 7.0 $x = $_GET['x'] ?? 'default'; ?>
- 122. Spaceship operator Very Cute<=> Replaces a lot of code Mainly useful for usort() <?php // PHP 5.6 if ($a > $b) { echo 1; } elseif ($a < $b) { echo -1; } else { echo 0; } // PHP 7.0 echo $a <=> $b; // 0
- 123. Generators delegation New yieldkeyword Save memory from n down to 1 value Good for long or infinite loops Search for range(), for() or loops <?php function factors($limit) { yield 2; yield 3; yield from primeTill1000(); for ($i = 1001; $i <= $limit; $i += 2) { yield $i; } } $prime = 1357; foreach (factors(sqrt($prime)) as $n) { echo "$n ". ($prime % $n ? ' not ' : '') . " factorn"; }
- 124. Generators returns <?php function factors($limit) { return 'first'; yield 2; return 'second'; yield 3; return 'third'; yield 5; } $gen = factors(sqrt($prime)); foreach ($gen as $n) { echo "$nn"; if ($n == 3) {break 1;} } print $gen->getReturn(); // second Generators returns Thelast return is accessible The generator returns the final state
- 125. Scalar typehint Whenever typeis tested => <?php function foo($x) { if (!is_string($x)) { throw new Exception('Type error while calling ' . __FUNCTION__); } ... } <?php function foo(string $x) { ... }
- 126. Scalar typehint backin 5.6 Whenever type is tested => <?php function foo(string $x) { } foo('that'); Catchable fatal error: Argument 1 passed to foo() must be an instance of string, string given, called in file..
- 127. Various scalar typehint int,float string, bool true, false, null void (PHP 7.1) mixed, object, resource, numeric (RFU) <?php function foo(?int $a, float $b, float $c) : ?int { return $a + $b + $c; } echo foo(null, 2, 1); // 4 echo foo(1.2, 2, 1); // 4 echo foo(1, 2.2, 1); // 4 echo foo(1, 2.7, 1.4); // 5
- 128. Option for stricttyping <?php // Enable strict types declare(strict_types=1); declare(encoding='ISO-8859-1'); declare(ticks=1); namespace FooBar; foo('that');
- 129.
- 130. Minimum args incustom functions is Fatal error <?php function foo(?int $a, float $b, float $c) { return $a + $b + $c; } echo foo(2, 1); Minimum args number Fatal error: Uncaught Error: Too few arguments to function foo(), 2 passed in
- 131. Helping at migration Documentthe evolutions between two versions Identify anchors in the code Link the migration to the actual code Keywords, syntax, code structures Suggest fallback, work-around, detection tools
- 132. Helping at migration Backwardincompatibilities Removed / renamed features Collaterals Changed behaviors
- 133. Helping at migration Newfeatures Fixing Totally new Spot previous work-arounds
- 135. Summary Check the manuals PHPlint is your friend Search in the code Use static analysis tools
- 136. Thank you! Damien Seguy@exakat dseguy@exakat.io https://www.exakat.io/ https://joind.in/event/php-uk-2017/schedule/list
- 137.