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(PHP 5)

stripos Trova la prima occorrenza in una stringa senza distinzione tra maiuscole e minuscole


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

Restituisce la posizione numerica della prima occorrenza di needle nella stringa haystack. Differentemente da strpos(), stripos() non distingue tra maiuscole e minuscole.

Occorre rilevare che needle può essere una stringa di uno o più caratteri.

Se needle non viene trovato, stripos() restituirà boolean FALSE.


Questa funzione può restituire il Booleano FALSE, ma può anche restituire un valore non-Booleano valutato come FALSE. Fare riferimento alla sezione Booleans per maggiori informazioni. Usare l'operatore === per controllare il valore restituito da questa funzione.

Example #1 Esempi di uso di stripos()

$mystring1 'xyz';
$mystring2 'ABC';

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

// No, 'a' non è certamente in 'xyz'
if ($pos1 === false) {
"The string '$findme' was not found in the string '$mystring1'";

// Notate l'uso di ===.  Semplicemente == non avrebbe funzionato come atteso
// perché la posizione di  'a' è nel carattere 0 (il primo).
if ($pos2 !== false) {
"We found '$findme' in '$mystring2' at position $pos2";

Se needle non è una stringa, sarà convertito in un intero e utilizzato come valore ordinale di un carattere.

Il parametro opzionale offset permette di indicare da quale carattere di haystack iniziare la ricerca. La posizione restituita sarà relativa all'inizio di haystack.

Nota: Questa funzione è binary-safe (gestisce correttamente i file binari)

Vedere anche strpos(), strrpos(), strrchr(), substr(), stristr(), strstr(), strripos() e str_ireplace().

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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
2 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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