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stristr

(PHP 4, PHP 5)

stristrVersion insensible à la casse de strstr()

Description

string stristr ( string $haystack , mixed $needle [, bool $before_needle = false ] )

Retourne une sous-chaîne de haystack, allant de la première occurrence de needle (incluse) jusqu'à la fin de la chaîne.

Liste de paramètres

haystack

La chaîne à chercher.

needle

Si needle n'est pas une chaîne, elle sera convertie en entier, et utilisée comme code ASCII du caractère correspondant.

before_needle

Si vaut TRUE, stristr() retourne la partie de haystack avant la première occurrence de needle (needle exclus).

needle et haystack sont traitées sans tenir compte de la casse.

Valeurs de retour

Retourne la partie de la chaîne correspondante. Si needle n'est pas trouvé, la fonction retourne FALSE.

Historique

Version Description
5.3.0 Ajout du paramètre optionnel before_needle.
4.3.0 stristr() s'effectue en respectant les chaînes binaires.

Exemples

Exemple #1 Exemple avec stristr()

<?php
  $email 
'USER@EXAMPLE.com';
  echo 
stristr($email'e'); // Affiche ER@EXAMPLE.com
  
echo stristr($email'e'true); // Depuis PHP 5.3.0, Affiche US
?>

Exemple #2 Teste si une chaîne de caractères est trouvée ou pas

<?php
  $string 
'Hello World!';
  if(
stristr($string'terre') === FALSE) {
   echo 
'"terre" non trouvé dans la chaîne de caractères';
  }
// affiche : "terre" non trouvé dans la chaîne de caractères
?>

Exemple #3 Utilisation d'une "chaîne de caractères" en chiffre

<?php
  $string 
'POMME';
  echo 
stristr($string112); // 112 = p minuscule
// Affiche : POMME
?>

Notes

Note: Cette fonction gère les chaînes binaires.

Voir aussi

  • strstr() - Trouve la première occurrence dans une chaîne
  • strrchr() - Trouve la dernière occurrence d'un caractère dans une chaîne
  • stripos() - Recherche la position de la première occurrence dans une chaîne, sans tenir compte de la casse
  • strpbrk() - Recherche un ensemble de caractères dans une chaîne de caractères
  • preg_match() - Expression rationnelle standard

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User Contributed Notes 8 notes

up
5
dpatton.at.confluence.org
11 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
up
2
Techdeck at Techdeck dot org
11 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
0
jukka
3 months 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
up
0
giz at gbdesign dot net
6 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
0
notepad at codewalkers dot com
9 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
-1
art at awilton dot dotcom
8 years ago
handy little bit of code I wrote to take arguments from the command line and parse them for use in my apps.

<?php

$i
= implode(" ",$argv); //implode all the settings sent via clie
$e = explode("-",$i); // no lets explode it using our defined seperator '-'

       //now lets parse the array and return the parameter name and its setting
       // since the input is being sent by the user via the command line
       //we will use stristr since we don't care about case sensitivity and
       //will convert them as needed later.

   
while (list($index,$value) = each($e)){

      
//lets grap the parameter name first using a double reverse string
       // to get the begining of the string in the array then reverse it again
       // to set it back. we will also "trim" off the "=" sign

    
$param = rtrim(strrev(stristr(strrev($value),'=')),"=");

      
//now lets get what the parameter is set to.
       // again "trimming" off the = sign

    
$setting = ltrim(stristr($value,'='),"=");

      
// now do something with our results.
       // let's just echo them out so we can see that everything is working

     
echo "Array index is ".$index." and value is ".$value."\r\n";
      echo
"Parameter is ".$param." and is set to ".$setting."\r\n\r\n";

}

?>

when run from the CLI this script returns the following.

[root@fedora4 ~]# php a.php -val1=one -val2=two -val3=three

Array index is 0 and value is a.php
Parameter is  and is set to

Array index is 1 and value is val1=one
Parameter is val1 and is set to one

Array index is 2 and value is val2=two
Parameter is val2 and is set to two

Array index is 3 and value is val3=three
Parameter is val3 and is set to three

[root@fedora4 ~]#
up
-1
greg at no_ggmac_reply dot com
3 years ago
Beware the example given here:

if stristr($message,'viagra')
or stristr($message,'cialis')
)
{
die();
}

stristr does not search for words, it finds matching substrings.  So, for example, the check for 'cialis' will trigger on 'specialist'
up
-1
tomas dot nesrovnal at yourspirit dot cz
5 years ago
Active item item in menu:

<?php
function aim($page) {
    if(
stristr($_SERVER['REQUEST_URI'], $page)) {
        return
' class="active"';
    }
}
?>

usage:

<style type="text/css">
.active {color: red;}
</style>

<?php
print '<a href="http://example.com/page/hello-world/"'. aim('hello-world') .'>HW</a>';
?>
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