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strripos

Description

The strripos String for PHP find the position of the last occurrence of a case-insensitive substring in a string.

Syntax

strripos(
    string $haystack,
    string $needle,
    int $offset = 0
): int|false

Parameters

haystack

The string to search in.

needle

The string to search for.

offset

If zero or positive, the search is performed left to right skipping the first offset bytes of the haystack.

If negative, the search is performed right to left skipping the last offset bytes of the haystack and searching for the first occurrence of needle.

NOTE: This is effectively looking for the last occurrence of needle before the last offset bytes.

Return

Returns the position where the needle exists relative to the beginnning of the haystack string (independent of search direction or offset).

Returns false if the needle was not found.

NOTE: String positions start at 0, and not 1.

WARNING: This function may return Boolean false, but may also return a non-Boolean value which evaluates to false. Use the === operator for testing the return value of this function.

Examples

1 · haystack needle

<?

$haystack = 'CASEcase';
$needle = 's';

$return = strripos($haystack, $needle);

echo $return;

?>
6

2 · offset · negative

<?

$haystack = 'CASEcase';
$needle = 's';
$offset = -4;

$return = strripos($haystack, $needle, $offset);

echo $return;

?>
2

3 · offset · non-negative

<?

$haystack = 'CASEcase';
$needle = 's';
$offset = 4;

$return = strripos($haystack, $needle, $offset);

echo $return;

?>
6

4 · return

<?

// use identity operator (===) instead of comparison operator (==) to test return

$haystack = 'abc';
$needle = 'a';

$return = strripos($haystack, $needle);

if($return === false)
{
    echo "not found";
}
else
{
    echo "found";
}

?>
found
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