Detailed explanation of PHP's methods and functions similar to indexof for processing strings

This article mainly introduces the relevant information on the detailed explanation of PHP's indexof-like method and function for processing strings. Friends in need can refer to the following

Detailed explanation of PHP's indexof-like method and function for processing strings

There are two functions or methods similar to indexof for processing strings in PHP. They are the strpos function and the stripos function. The usage of these two functions is similar.

When the strpos function processes a string, if it contains the string, it returns the position of the first occurrence of the string, and returns false if it does not appear. Sensitive to string case.

When the stripos function processes a string, if it contains the string, it returns the position of the first occurrence of the string, and returns false if it does not appear. String case insensitivity.

PHP strpos() function

Definition and usage

strpos() Function finds the first occurrence of a string within another string.

Note: The strpos() function is case-sensitive.

Note: This function is binary safe.

Syntax

strpos(string, find, start)

Parameter description

string : Required. Specifies the string to search for.
find: required. Specifies the string to search for.
start: optional. Specifies the location from which to start the search.

Return value

Returns the position of the first occurrence of a string in another string, or returns FALSE if the string is not found .

Note: The string position starts from 0, not from 1.

Example

<?php
echo strpos(&#39;Hello world!&#39;, &#39;wo&#39;);
?>

Output: 6

PHP stripos( ) Function

#Definition and usage

stripos() function finds the first occurrence of a string in another string Location.

Note: The stripos() function is not case-sensitive.

Note: This function is binary safe.

Syntax

stripos(string,find,start)

Parameter description

string : Required. Specifies the string to search for.
find: required. Specifies the string to search for.
start: optional. Specifies the location from which to start the search.

Return value

Returns the position of the first occurrence of a string in another string, or returns FALSE if the string is not found .

Note: The string position starts from 0, not from 1.

Example

<?php
echo stripos(&#39;Hello world!&#39;, &#39;WO&#39;);
?>

Output: 6

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