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PHP Functions Online


strpos

(PHP 4, PHP 5)

strposFind the position of the first occurrence of a substring in a string

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

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Preview #

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Description #

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

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

Parameters #

haystack

The string to search in.

needle

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 beginning of the haystack string (independent of offset). Also note that string positions start at 0, and not 1.

Examples #

Example #1 Using ===

<?php
$mystring 
'abc';
$findme   'a';
$pos strpos($mystring$findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo 
"The string '$findme' was not found in the string '$mystring'";
} else {
    echo 
"The string '$findme' was found in the string '$mystring'";
    echo 
" and exists at position $pos";
}
?>

Notes #

Note: This function is binary-safe.

See Also #

  • Main PHP Function Online page
  • stripos() - Find the position of the first occurrence of a case-insensitive 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
  • strstr() - Find the first occurrence of a string
  • strpbrk() - Search a string for any of a set of characters
  • substr() - Return part of a string
  • preg_match() - Perform a regular expression match