PHP 5 String Functions The PHP string functions are part of the PHP core. No installation is required to use these functions.

1.  PHP String Functions

2.  Md. Alamgir Hossen
IECL

3.  The addcslashes() function returns a string with backslashes
in front of the specified characters.
$str = "Welcome to my humble Homepage!";
echo addcslashes($str,'m')."<br>";
echo addcslashes($str,a..z')."<br>";
 Output
Welcome to my humble Homepage!
Welcome to my humble Homepage!

4.  Returns a string with backslashes in front of predefined
characters

$str = "Is your name O'Reilly?";
echo addslashes($str);
 Outputs:
 Is your name O'Reilly?

5.  Breaks a string into an array
 $myStr = "We are lerning PHP"; delimiter
 print_r (explode(" " ,$myStr)); source string
 output
 Array (
 [0] => We
 [1] => are
 [2] => lerning
 [3] => PHP
)

6.  $myStr = "We are lerning PHP";
 $str = explode(" ",$myStr);
 echo $str[0]. " ". $str[1] ." ".$str[2]." ".$str[3];
 Output:
 We are lerning PHP

 $myStr = "We,are,lerning,PHP";
 print_r(explode(",",$myStr,-3));
 Output:
 ???

7.  Returns a string from the elements of an array
$arr = array('Hello','World!','Beautiful','Day!');
echo implode(',', $arr);
Output:
Hello,World!,Beautiful,Day!

8. <?php
$city = array("Dhaka", "Chittagong", "Rajshahi","Sylet",
"Khulna", "Barishal");
$checker = is_array($city);
var_dump($checker);
echo $checker;
?>
 Output:
bool(true)
1

9. <?php
$ arrayList = array('HTML','CSS','PHP');
echo count($arrayList);
?>
Output:
3
$country = array(
"Asia" => array("Bangladesh","India","Pakistan"),
"Europe" => array("England","France"),
"Africa" => array("Kenya","Libya","Somalia")
);
echo count($country,COUNT_RECURSIVE);
Output:
11

10.  Returns the length of a string
<?php
$strLen = 'I love php, I love php too';
echo strlen($strLen);
?>
Output:
26

11. <?php
$y = 'something';
$z = 'test';
$x = isset($y,$z);
var_dump($x);
?>
Output:
bool(true)
<?php
echo isset($result[0]['column_name']) ? $result[0]['column_name'] : ‘ ';
?>
() ? : ‘ ’;

12. <?php
echo round(9.3545,3);
?>
Output:
9.355

13. Converts the first character of a string to uppercase
<?php
echo ucfirst("hello world!");
?>
Output:
Hello world!

14.  Converts the first character of each word in a string to
uppercase
<?php
echo ucwords("hello world hello world hello world");
?>
Output:
Hello World Hello World Hello World

15. <?php
$x = '<h1><span>Bangladesh is a country of natural
beauty</span></h1>
<p>I love codeing</p> <h3> Alomgir </h3>‘ ;
echo strip_tags($x,'<h1><p><h3>');
?>
output:
 Bangladesh is a country of natural beauty
 I love codeing
 Alomgir

16. <?php
echo floor(2.5);
?>
Ouput:
2