PHP 5.4.36 Released

stripos

(PHP 5)

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

Descrizione

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.

Avviso

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()

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

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

// No, 'a' non è certamente in 'xyz'
if ($pos1 === false) {
    echo 
"The string '$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 ($pos2 !== false) {
    echo 
"We found '$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 4 notes

up
12
emperorshishire at gmail dot com
5 years ago
I found myself needing to find the first position of multiple needles in one haystack.  So I wrote this little function:

<?php
function multineedle_stripos($haystack, $needles, $offset=0) {
    foreach(
$needles as $needle) {
       
$found[$needle] = stripos($haystack, $needle, $offset);
    }
    return
$found;
}

// 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) {
     ["fox"]=>
     int(16)
     ["dog"]=>
     int(40)
     ["."]=>
     int(43)
     ["duck"]=>
     bool(false)
   }
*/
?>
up
1
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.

<?php
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
?>
up
-2
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) {
            return
true;
        }
    }
    return
false;
}
?>
up
-5
grf at post dot cz
7 years ago
this would to work with any language, i hope.
tested on czech (eastern europe) lang.

<?php
/****************************************
*    SAFE HIGHLIGHT
****************************************/
/**
* 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))
        return
$subject;
       
   
// empty keys throw-off, only unique, reindex
   
$nA = array_values(
           
array_unique(
               
array_diff( $needleArr, array(''))
            )
        );
   
   
// needle count
   
if( !($nC = count( $nA)))
        return
$subject; // nothing to hl
       
    // shear length
   
if( !(($rLL = mb_strlen( $rL = $shearLft, $e))
    + (
$rRL = mb_strlen( $rR = $shearRgt, $e))))
        return
$subject; // no shears
   
    // subject length
   
if( !($sL = mb_strlen( $s = $subject, $e)))
        return
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++)
                if(
$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)
                break;
           
        }
// while()
       
   
} // for( $n=0; $n<$nC; $n++)
   
    // oouu yeaaa, kick the subject out of the function
   
return $s;
   
}
// function safeHighlight()
/****************************************
*    END: SAFE HIGHLIGHT
****************************************/
?>
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