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().

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User Contributed Notes 5 notes

down

dpatton.at.confluence.org ¶

22 years ago

There was a change in PHP 4.2.3 that can cause a warning message
to be generated when using stristr(), even though no message was
generated 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 in
4.0.6, 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

down

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

}

?>

down

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".

down

-1

notepad at codewalkers dot com ¶

19 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



?>

down

-3

jukka ¶

10 years ago

I think there is a bug in php 5.3 in stristr with uppercase Ä containing other character

http://pastebin.com/5bP6uztY

if 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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