(PHP 5)

stripos Encontra a primeira ocorrencia de uma string sem diferenciar maiúsculas e minúsculas


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

Retorna a posição numerica da primeira ocorrencia de needle na string haystack. Diferentemente de strpos(), stripos() não diferencia maiúsculas e minúsculas.

Note que o parâmetro needle deve ser uma string de um ou mais caracteres.

Se needle não for encontrada, stripos() irá retornar boolean FALSE.


Esta função pode retornar o booleano FALSE, mas também pode retornar um valor não-booleano que pode ser avaliado como FALSE, como 0 ou "". Leia a seção em Booleanos para maiores informações. Utilize o operador === para testar o valor retornado por esta função.

Exemplo #1 Exemplos stripos()

$mystring1 'xyz';
$mystring2 'ABC';

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

// 'a' certamente não esta em 'xyz'
if ($pos1 === false) {
"A string '$findme' não foi encontrada na string '$mystring1'";

// Note o nosso uso de  ===. Simples == não funcionaria como o esperado
// porque a posição de 'a' é 0 (primeiro) caractere.
if ($pos2 !== false) {
"Nós encontramos '$findme' em '$mystring2' na posição $pos2";

Se needle não é uma string, é convertida para um inteiro e aplicado o valor do caractere.

O parâmetro opcional offset permite a você especificar apartir de qual caractere em haystack a procura começa. A posição retornada ainda é relativa ao inicio de haystack.

Veja também strpos(), strrpos(), strrchr(), substr(), stristr(), strripos(), strstr() e stri_replace().

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User Contributed Notes 5 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
27 days 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.
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
steve at opilo dot net
1 year 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) {
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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