Detailed description of the methods and functions for PHP to process strings similar to indexof, and detailed description of indexof

Detailed description of the methods and functions for PHP to process strings similar to indexof, and detailed description of indexof

Detailed description of the methods and functions for PHP to process strings similar to indexof

In PHP, there are two functions or methods for processing strings similar to indexof. They are strpos functions and stripos functions. The usage of these two functions is similar.

If the strpos function processes a string that contains the string, it returns the position of the first occurrence of the string. If the string does not appear, it returns false. String is case sensitive.

When the stripos function processes a string that contains the string, it returns the position where the string appears for the first time. If the string does not appear, it returns false. It is not case sensitive to strings.

PHP strpos () function

Definition and usage

The strpos () function is used to locate the first occurrence of a string in another string.

Note: The strpos () function is case sensitive.

Note: This function is binary secure.

Syntax

strpos(string, find, start)

Parameter description

String: required. Specifies the string to be searched.
Find: required. Specifies the string to be searched.
Start: Optional. Specifies the location where the search starts.

Return Value

Returns the position where the string appears for the first time in another string. If no string is found, FALSE is returned.

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

Example

<?phpecho strpos('Hello world!', 'wo');?>

Output: 6

PHP stripos () function

Definition and usage

The stripos () function is used to locate the first occurrence of a string in another string.

Note: The stripos () function is case-insensitive.

Note: This function is binary secure.

Syntax

stripos(string,find,start)

Parameter description

String: required. Specifies the string to be searched.
Find: required. Specifies the string to be searched.
Start: Optional. Specifies the location where the search starts.

Return Value

Returns the position where the string appears for the first time in another string. If no string is found, FALSE is returned.

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

Example

<?phpecho stripos('Hello world!', 'WO');?>

Output: 6

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