strstr – PHP String Functions

Syntax :

Description :

strstr() function will find the first occurrence of search in a string

Parameter :

• string – This is a Required parameter. This is the string which is to be searched.
• search – This is a Required parameter. It contains the value to be seacrhed. If we pass this parameter as a number, then it will search for the character matching the ASCII value of the number.
• before_search –  This is an Optional parameter. A Boolean value, default is set to “false”.  If set to “true”, it returns the part of the string before the first occurrence of the search parameter.

Output :

It will returns below values are:

• the portion of string after the first occurrence is found in the string
• FALSE if the search is not found in the string.

ChangeLog :

[table caption=”” width=”100%” colwidth=”25%|75%” colalign=”left|left”]
Version, Description
PHP 5.3 , The before_search parameter was added.
PHP 4.3.0, strstr() was made binary safe function.

[/table]

Related articles : strchr(), stristr(), strpos(), strrchr() strpbrk().

strstr() – PHP Functions Example 1 : It returns the string from the first occurrence of search is found.

<?php
echo strstr("Hi from tutorialmines.","from"); // case-sensitive comparison
?>

Output of above code in the browser is as below:

strstr() – PHP Functions Example 2 : It will find the first occurrence of character “f”, its ASCII value is 102.

<?php
echo strstr("Hi from tutorialmines.",102);// ASCII value of f is 102.
?>

Output of above code in the browser is as below:

strstr() – PHP Functions Example 3 : Using before_search parameter.

<?php
echo "Using before_search 3rd parameter in the function<br />";
echo strstr("Hi from tutorialmines.","tutorialmines",true); // case-sensitive comparison
echo "<br/>";
echo strstr("Hi from tutorialmines.",116,true);// ASCII value of t is 116.
?>

Output of above code in the browser is as below:

strstr() – PHP Functions Example 4 : It will return FALSE, if string is not found in the search.

<?php
echo "returns false, if search string is not found.<br />";
var_dump(strstr("Hi from tutorialmines.","the"));// returns false, if search string is not found.
echo "<br/>";
var_dump(strstr("Hi from tutorialmines.","me",true)); // case-sensitive comparison
echo "<br/>";
var_dump(strstr("Hi from tutorialmines.",098,true));// ASCII value of bt is 098.
?>

Output of above code in the browser is as below: