How to use php strstr function

In PHP, the strstr() function is used to determine whether a string exists in another string. The syntax format is "strstr(string,search,before_search)"; if so, return the string and the remaining part, otherwise returns FALSE.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

strstr() function is a built-in function in PHP . This function searches for the presence of a string in another string; it searches for the first occurrence of that string in another string and displays the latter part. This function is case-sensitive.

Syntax

strstr(string,search,before_search)

Parameters	Description
string	Required. Specifies the string to be searched for.
search	Required. Specifies the string to search for. If the argument is a number, searches for characters that match the ASCII value for that number.
before_search	Optional. A Boolean value with a default value of "false". If set to "true", it will return the portion of the string preceding 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.

Example 1: Determine whether "world" exists in "Hello world!"

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

Output:

world!

Example 2: Search a string by the ASCII value of "o" and return the remaining part of the string

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

Output:

o world!

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