stristr

    (PHP 4, PHP 5, PHP 7, PHP 8)

    stristr — Versione insensibile alle maiuscole/minuscole di strstr()

    Descrizione

    stristr(string $haystack, string $needle): string

    Restituisce il contenuto di haystack dalla prima occorrenza di needle fino alla fine. needle e haystack sono esaminati senza distinguere tra lettere maiuscole e minuscole.

    Se needle non viene trovato, la funzione restituisce false.

    Se needle non è una stringa, viene convertito in un intero e si utilizza il valore ordinale del carattere.

    Example #1 Esempio di uso di stristr()

    <?php
    $email     = 'USER@EXAMPLE.com';
    echo     stristr($email, 'e');
    // outputs ER@EXAMPLE.com
    ?>

    Example #2 Verifica se una stringa esiste o meno

    <?php
    $string     = 'Hello World!';
    if(    stristr($string, 'earth') === FALSE) {
    echo     '"earth" not found in string';
    }
    // outputs: "earth" not found in string
    ?>

    Example #3 Utilizzo di un dato non stringa da cercare

    <?php
    $string     = 'APPLE';
    echo     stristr($string, 97); // 97 = lowercase a
    // outputs: APPLE
    ?>

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

    Vedere anche strstr(), strrchr(), substr() e ereg().

    Found A Problem?

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    User Contributed Notes 5 notes

    up
    17
    dpatton.at.confluence.org
    22 years ago
    There was a change in PHP 4.2.3 that can cause a warning messageto be generated when using stristr(), even though no message wasgenerated in older versions of PHP.The following will generate a warning message in 4.0.6 and 4.2.3:  stristr("haystack", "");     OR  $needle = "";  stristr("haystack", $needle);This will _not_ generate an "Empty Delimiter" warning message in4.0.6, but _will_ in 4.2.3:  unset($needle); stristr("haystack", $needle);Here's a URL that documents what was changed:http://groups.google.ca/groups?selm=cvshholzgra1031224321%40cvsserver
    up
    7
    giz at gbdesign dot net
    17 years ago
    Just been caught out by stristr trying to converting the needle from an Int to an ASCII value.

Got round this by casting the value to a string.

<?php
if( !stristr( $file, (string) $myCustomer->getCustomerID()  ) ) {
  // Permission denied
}
?>
    up
    3
    Techdeck at Techdeck dot org
    22 years ago
    An example for the stristr() function:<?php$a = "I like php";if (stristr("$a", "LikE PhP")) {print ("According to \$a, you like PHP.");}?>It will look in $a for "like php" (NOT case sensetive. though, strstr() is case-sensetive).For the ones of you who uses linux.. It is similiar to the "grep" command.Actually.. "grep -i".
    up
    -1
    notepad at codewalkers dot com
    20 years ago
    <?php

function stristr_reverse($haystack, $needle) {
  $pos = stripos($haystack, $needle) + strlen($needle);
  return substr($haystack, 0, $pos);
}
$email = 'USER@EXAMPLE.com';
echo stristr_reverse($email, 'er');
// outputs USER

?>
    up
    -3
    jukka
    11 years ago
    I think there is a bug in php 5.3 in stristr with uppercase Ä containing other characterhttp://pastebin.com/5bP6uztYif you search only with täry it works, but as soon as the word is tärylä  it does not. TÄRYL works fine
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