This document provides examples of using various PHP string handling and date functions. It demonstrates functions like substr(), str_replace(), strlen(), strpos(), strtolower(), strtoupper(), and date(). It also shows how to include external PHP files using the include statement to reuse code like custom functions across files.

1. PHP Function
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PHP MySQL Ajax(jquery)
Web Application F

2. PHP Function
F function
function( F F ก F F )
{
…….. ;
…….. ;
return F F ก F ก ;
}
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ก
PHP MySQL Ajax(jquery)
Web Application F

3. PHP Function
<?php
echo hello();
function hello()
{
return "hello";
}
?>
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PHP MySQL Ajax(jquery)
Web Application F

4. PHP Function
<?php
echo showNum(1);
function showNum($n)
{
if($n=="1")
{return 1;}
else if($n=="2")
{return 2;}
}
?>
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Web Application F
PHP MySQL Ajax(jquery)

5. PHP Function
showStart(3);
function showStart($n){
$count1=1;
while($count1<=$n){$count2=1;
while($count2<=$count1)
{echo "*";$count2++;}
echo "<br />";
$count1++;}
}
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PHP MySQL Ajax(jquery)
Web Application F

6. PHP Sub String Function
substr(string,start position,length );
F
<?php
$str="abc";
echo substr($str,1,1);
?>
F F b
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Web Application F

7. PHP Sub String Function
<?php
$str="abc";
echo substr($str,1);
?>
F
F
F
bc
F
ก F F F
F
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ˈ F
F
string
F
F
Web Application F
string
F ก
F ก
string
F
F

8. PHP Sub String Date
<?php
echo showDate("2010-10-18");
function showDate($date)
{
$day=substr($date,8,2);
$month=substr($date,5,2);
$year=substr($date,0,4);
return $day."/".$month."/".$year;
}
?>
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ก
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Web Application F

9. PHP String Replace
<?php
$str="hello WORLD";
echo str_replace("hello","HELLO",$str);
?>
F F HELLO WORLD
ก
F
F F string
ก
F ก F ก
F
string
F
string F
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Web Application F
string

10. PHP String Replace
<?php
$str="anbncn";
echo str_replace("n","<br />",$str);
?>
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ก
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Web Application F

11. PHP String Length
Function strlen() F
<?php
echo strlen("php");
?>
F F ˈ
php
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PHP MySQL Ajax(jquery)
Web Application F
ก
ก
F 3
string F
ก

12. PHP String Length
<?php
$str="12345";
if(strlen($str)>6){echo "greater than 6 ";}
else{echo “less than 6”;}
?>
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Web Application F

13. PHP String Position
strpos($string, "find string")
Function strpos F
F
F F
string
$string
string
ก
find string
ก
F ก
<?php
$str="@bc";
echo strpos($str,"@");
?> ก
F
ก
0
ก
F 0
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Web Application F
F
ก
F ก
F
F
F
F
Fก
F
F
F

14. PHP String Position
ก
F
F ก F
function strpos return false
<?php
$mystring = 'bc';
$findme = 'a';
$pos = strpos($mystring, $findme);
if ($pos === false) {
echo "The string ”.$findme.“ was not found in the string”;
}
?>
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Web Application F

15. F ก
ก
file
<?php
$file_name="my_picture.jpg";
$type = substr($file_name, strpos($file_name,"."));
echo $type;
?>
F
ก
.jpg
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Web Application F

16. ก
string
ก
string ก
ก
function strtolower()
<?php
$str1="HeLLoWoRLd";
$str2=strtolower($str1);
echo $str2;
?>
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ก
PHP MySQL Ajax(jquery)
Web Application F
ก
F ˈ
F ˈ
F ก
F ก F F

17. ก
string
ก
string ก
ก
function strtoupper()
<?php
$str1=“heLLoWoRld";
$str2= strtoupper($str1);
echo $str2;
?>
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ก
PHP MySQL Ajax(jquery)
Web Application F
ก
F ˈ
F ˈ
F
F F
F F F

18. F function date()
ʾ
ก F ก
ˆ
function date() F
• date("d/m/Y")
• ก F ก
F
ˆ
• date("H:i:s")
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/ ʾ
/
•
ˆ
Web Application F
ˈ
:
F
:
F

19. ʾ
•
•
•
•
•
•
•
•
F function date()
function date()
F ก
F
ˈ
d
m
Y
ʾ ..
ก
y
ʾ ..
ก
H
ˈ
i
s
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PHP MySQL Ajax(jquery)
F parameter
ʾ
Web Application F
ˈ sting
F

20. ก
F
<?php
$strDate1="2012-01-01";//
F
$strDate2="2012-02-1";//
echo DateDiff($strDate1,$strDate2);
// ก function DateDiff
F
F
F
// F function DateDiff
F
F $strDate1
$strDate2
function DateDiff($strDate1,$strDate2)
{
//
ˈ
F
// F
F 86400 ( 1
86400
)
F
return (strtotime($strDate2) - strtotime($strDate1))/ ( 60 * 60 * 24 );
}
?> projectsoft.biz
PHP MySQL Ajax(jquery)
ก
Web Application F

21. ก
/F
<?php
//ก
echo date('Y-m-d', strtotime(' +1 day'));//
n
php
F
echo date('Y-m-d', strtotime('+60 day', strtotime("2012-5-2")));
//
ก
2 2554 60
//ก
กF
F
echo date('Y-m-d', strtotime(' -1 day'));//
echo date('Y-m-d', strtotime('-60 day', strtotime( "2012-1-31" )));
//
F
ก
1 2554 60
?>
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Web Application F

22. PHP Include
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PHP MySQL Ajax(jquery)
Web Application F

23. PHP include
include(“
F.php”);
include(“
.php”);
F
ก
F
include
F F
F include1_1.php
<?php echo "Hello ";?>
<?php
include("include1_1.php");
echo " World";
?>
F F Hello World
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PHP MySQL Ajax(jquery)
Web Application F
F

24. PHP include
F
F include1_1.php F folder include
F
ก
<?php
include("include/include1_1.php");
echo " World";
?>
F
F
F
F
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ก
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ˈ Hello World
F ก F
Web Application F
F
F
F
F ก include

25. PHP include + Function
F showDate.php
F function F
<?php
function showDate($date)
{
$day=substr($date,8,2);
$month=substr($date,5,2);
$year=substr($date,0,4);
return $day."/".$month."/".$year;
}
?>
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Web Application F

26. PHP + Include
<?php
include("function/showDate.php");
$date=showDate("2010-10-01");
echo $date;
?>
F
include
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function showDate F
Web Application F