PHP 5.6.16 is available


(PHP 5)

striposFind the position of the first occurrence of a case-insensitive substring in a string


int 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.



The string to search in.


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.


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.

Zwracane wartości

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.


Ta funkcja może zwrócić Boolean FALSE, ale może też zwrócić wartość innego typu niż Boolean, która oznacza wartość FALSE, takie jak 0 lub "". Aby uzyskać więcej informacji proszę zapoznać się z rozdziałem Typy logiczne. Można używać operatora === do testowania zwracanych wartości przez tę funkcję.


Przykład #1 stripos() examples

$mystring1 'xyz';
$mystring2 'ABC';

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

// Nope, 'a' is certainly not in 'xyz'
if ($pos1 === false) {
"The string '$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 ($pos2 !== false) {
"We found '$findme' in '$mystring2' at position $pos2";


Informacja: Ta funkcja jest bezpieczna dla danych binarnych.

Zobacz też:

  • strpos() - Find the position of the first occurrence of a substring in a string
  • strrpos() - Znajduje pozycję ostatniego wystąpienia znaku w ciągu znaków
  • 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.

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User Contributed Notes 6 notes

emperorshishire at gmail dot com
6 years ago
I found myself needing to find the first position of multiple needles in one haystack.  So I wrote this little function:

function multineedle_stripos($haystack, $needles, $offset=0) {
$needles as $needle) {
$found[$needle] = stripos($haystack, $needle, $offset);

// It works as such:
$haystack = "The quick brown fox jumps over the lazy dog.";
$needle = array("fox", "dog", ".", "duck")
var_dump(multineedle_stripos($haystack, $needle));
/* Output:
   array(3) {
spam at kleppinger dot com
8 months ago
Regarding the function by spam at wikicms dot org

It is very bad practice to use the same function name as an existing php function but have a different output format.  Someone maintaining the code in the future is likely to be very confused by this.  It will also be hard to eradicate from a codebase because the naming is identical so each use of stripos() would have to be analyzed to see how it is expecting the output format (bool or number/bool).

Calling it string_found() or something like that would make a lot more sense for long-term use.
Ian Macdonald
3 months ago
Regarding the === note, it might be worth clarifying that the correct tests for a binary found/not found condition are  !==false to detect found, and ===false to detect not found.
steve at opilo dot net
2 years ago
A handy function if you need to adjust layout based on whether or not a string contains descending letters:

<?php function containsDescenders($text) {
$descenders = array("g","j","p","q","y");
    foreach (
$descenders as $letter) {
        if (
stripos($text,$letter) !== false) {
spam at wikicms dot org
1 year ago
If you like using ternary operator, I wrote simple example how to use stripos function.
Also, in my example I add "How to use namespaces" for wide knowledges for newbies.

namespace My;

//You can be free using core functions in your NameSpaces (My)
function stripos($haystack, $needle) {
//To call core function (from global NS) you should add backslash only - \func
return (FALSE === \stripos($haystack, $needle)) ? FALSE : TRUE;

var_dump(stripos($haystack = 'John knows English language.', $needle = 'john')); //TRUE
var_dump(stripos($haystack = 'Sara knows English language too.', $needle = 'john')); //FALSE
grf at post dot cz
8 years ago
this would to work with any language, i hope.
tested on czech (eastern europe) lang.

* function finds and encase every string in a $needleArr array with
* strings $shearLft (from the left side) and $shearRgt (guess from which
* side).
* already encased needles are IGNORED for any other step, so order
* of needles in $needleArr is pretty important.
* function is searching needles in case-insensitive mode,
* but case in the subject is saved.
* can you do it better? so, do it.
* @param array $needleArr array of needles
* @param string $shearLft left shear
* @param string $shearRgt right shear
* @param string $subject subject
* @param string $encoding encoding ('utf-8' is default)
* @author griffin
function safeHighlight( $needleArr, $shearLft, $shearRgt, $subject, $encoding = 'utf-8')
// encoding
$e = $encoding;
// oh, no needles
if( !is_array( $needleArr))
// empty keys throw-off, only unique, reindex
$nA = array_values(
array_diff( $needleArr, array(''))
// needle count
if( !($nC = count( $nA)))
$subject; // nothing to hl
    // shear length
if( !(($rLL = mb_strlen( $rL = $shearLft, $e))
    + (
$rRL = mb_strlen( $rR = $shearRgt, $e))))
$subject; // no shears
    // subject length
if( !($sL = mb_strlen( $s = $subject, $e)))
null; // empty subject
    // subject in lowercase (we need to aviod
    // using mb_stripos due to PHP version)
$sW = mb_strtolower( $s, $e);
// masking ~ 0=not changed, 1=changed
$m = str_repeat( '0', $sL);
// loop for each needle
for( $n=0; $n<$nC; $n++)
// needle string loWercase
$nW = mb_strtolower( $nA[ $n], $e);
$o = 0; // offset
$nL = mb_strlen( $nW, $e); // needle length

        // search needle
while( false !== ($p = mb_strpos( $sW, $nW, $o, $e)))
// oh hurrey, needle found on $p position
            // is founded needle already modified? (in full-length)
for( $q=$p; $q<($p+$nL); $q++)
$m[ $q])
// ai, caramba. already modified, jump over
$o+= $nL;
// continue for while() loop - not for for() loop!
continue 2;
// explode subject and mask into three parts
            // partA|needle|partB
$sE[0] = mb_substr( $s, 0, $p, $e);
$sE[1] = mb_substr( $s, $p, $nL, $e);
$sE[2] = mb_substr( $s, $p+$nL, $sL-$p-$nL, $e);
// mask
            // partA|partB (needle not needed)
$mE[0] = mb_substr( $m, 0, $p, $e);
$mE[1] = mb_substr( $m, $p+$nL, $sL-$p-$nL, $e);
// apply shears
$sE[1] = $rL.$sE[1].$rR;
// update sunject length
$sL+= $rLL + $rRL;
// update mask
$m = $mE[0] . str_repeat( '1', $rLL + $nL + $rRL) . $mE[1];
// implode into a subject
$s = implode( $sE);
// update lowercase subject
$sW = mb_strtolower( $s, $e);
// increase offset
$o+= $rLL + $nL + $rRL;
// end of string reached
if( $o>=$sL)
// while()
} // for( $n=0; $n<$nC; $n++)
    // oouu yeaaa, kick the subject out of the function
return $s;
// function safeHighlight()
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