stripos

(PHP 5)

stripos — Find the position of the first occurrence of a case-insensitive substring in a string

Description

mixed stripos ( string $haystack , string $needle [, int $offset = 0 ] )

Find the numeric position of the first occurrence of needle in the haystack string.

Unlike the strpos(), stripos() is case-insensitive.

Parameters

haystack

The string to search in.

needle

Note that the needle may be a string of one or more characters.

If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.

offset

If specified, search will start this number of characters counted from the beginning of the string. Unlike strrpos() and strripos(), the offset cannot be negative.

Return Values

Returns the position of where the needle exists relative to the beginnning of the haystack string (independent of offset). Also note that string positions start at 0, and not 1.

Returns FALSE if the needle was not found.

Warning

This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

Examples

Example #1 stripos() examples

<?php
$findme    = 'a';
$mystring1 = 'xyz';
$mystring2 = 'ABC';

$pos1 = stripos($mystring1, $findme);
$pos2 = stripos($mystring2, $findme);

// Nope, 'a' is certainly not in 'xyz'
if ($pos1 === false) {
    echo "The string '$findme' was not found in the string '$mystring1'";
}

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' is the 0th (first) character.
if ($pos2 !== false) {
    echo "We found '$findme' in '$mystring2' at position $pos2";
}
?>

Notes

Note: This function is binary-safe.

See Also

  • mb_stripos() - Finds position of first occurrence of a string within another, case insensitive
  • strpos() - Find the position of the first occurrence of a substring in a string
  • strrpos() - Find the position of the last occurrence of a substring in a string
  • strripos() - Find the position of the last occurrence of a case-insensitive substring in a string
  • stristr() - Case-insensitive strstr
  • substr() - Return part of a string
  • str_ireplace() - Case-insensitive version of str_replace.