How to use php stristr function?

php The stristr function is used to search for the first occurrence of a string in another string. Its syntax is stristr(string,search,before_search). The parameter string is required and specifies the string to be searched; search is required and specifies The string to search for.

#php How to use stristr function?

Definition and Usage

stristr() function searches for the first occurrence of a string within another string.

Note: This function is binary safe.

Note: This function is not case sensitive. For case-sensitive searches, use the strstr() function.

Syntax

stristr(string,search,before_search)

Parameters

string Required. Specifies the string to be searched for.

search Required. Specifies the string to search for.

If the parameter is a number, search for characters matching the ASCII value corresponding to the number.

before_search Optional. The default value is a Boolean value of "false".

If set to "true", it will return the portion of the string before the first occurrence of the search parameter.

Return value: Returns the remaining part of the string (from the matching point). Returns FALSE if the searched string is not found.

PHP version: 4

Change log:

In PHP 5.3, the before_search parameter is added.

In PHP 4.3, this function becomes binary safe.

Example 1

Search for a string with the ASCII value of "o" and return the remainder of the string:

<?php
echo stristr("Hello world!",111);
?>

Output:

o world!

Example 2

Return the part of the string before the first occurrence of "world":

<?php
echo stristr("Hello world!","WORLD",true);
?>

Output:

Hello

Example 3

Find the first occurrence of "world" in "Hello world!" and return the rest of the string:

<?php
echo stristr("Hello world!","WORLD");
?>

Output:

world!

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