strlen

stripslashes

Last updated: Fri, 03 Feb 2012

stristr

(PHP 4, PHP 5)

stristr — strstr() sem diferenciar maiúsculas e minúsculas

Descrição

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

Retorna tudo de haystack apartir da primeira ocorrência de needle até o final.

Parâmetros

haystack: A string onde será feita a busca.
needle: Se needle não é uma string, ela é convertida para inteiro e é usado como valor ordinal do caractere.
before_needle: Se TRUE (o padrão é FALSE), stristr() retorna a parte de haystack antes da primeira ocorrência de needle.

needle e haystack são examinadas de uma maneira que não diferencia maiúsculas e minúsculas.

Valor Retornado

Retorna a substring encontrada. Se needle não for encontrada, retorna FALSE.

Histórico

Versão	Descrição
5.3.0	Adicionado o parâmetro opcional `before_needle`.
4.3.0	stristr() tornou-se binary safe.

Exemplos

Exemplo #1 Exemplo da stristr()


<?php
  $email = 'USER@EXAMPLE.com';
  echo stristr($email, 'e'); // outputs ER@EXAMPLE.com
  echo stristr($email, 'e', true); // A partir do PHP 5.3.0, mostra US
?>

Exemplo #2 Testing if a string is found or not


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

Exemplo #3 Using a non "string" needle


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

Notas

Nota: Esta função é compatível com dados binários

Veja Também

strstr() - Encontra a primeira ocorrencia de uma string
strrchr() - Encontra a ultima ocorrência de um caractere em uma string
substr() - Retorna uma parte de uma string
preg_match() - Perform a regular expression match

strlen

stripslashes

Last updated: Fri, 03 Feb 2012

User Contributed Notes
stristr

greg at no_ggmac_reply dot com
12-Jan-2011 11:20


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'

jahforlove at gmail dot com
15-Oct-2010 07:58


Use it to emulate the before_needle php V5.3 :



<?php

//$h = haystack, $n = needle 

if($pos=stripos($h,$n)) $string=substr($h,0,$pos);

?>

andy
08-Mar-2010 06:44


Quick way to use this with an array for a needle:





<?php


$arr = array('search_term1','search_term2','search_term3');





foreach($arr as $key => $search_needle) {





   if(stristr($haystack, $search_needle) != FALSE) {


        echo 'execute this code if found';


   }





}


?>

carel at ckbt dot org
13-May-2009 05:18


if stristr($message,'viagra')

or stristr($message,'cialis')

)

{

die();

}



Works quite well in any Shoutbox, Forum, Guestbook, Mailform, etcetera.



Just enter between the definitions and sending the message to the DB, et voila. ^_^

tomas dot nesrovnal at yourspirit dot cz
18-Dec-2008 10:36


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>'; 

?>

giz at gbdesign dot net
06-Oct-2007 02:02


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


}


?>

art at awilton dot dotcom
07-Nov-2005 07:17


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 ~]#

triadsebas at triads dot buildtolearn dot net
21-Jul-2005 02:39


You can use strstr() or stristr() to validate data!


Check this out:


<?php


function validate_email($input) {


  if (!stristr($input, '@')) {


    return false;


  }


  return true;


}





function validate_url($input) {


  if (!stristr($input, 'http://')) {


    return false;


  }


  return true;


}


?>


Simple example:


<?php


if (!validate_email($_POST['email'])) {


  print 'You did not enter a valid email adress';


}


if (!validate_url($_POST['url'])) {


  print 'You did not enter a valid url.';


}


?>

notepad at codewalkers dot com
04-Jun-2005 10:02


<?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





?>

Techdeck at Techdeck dot org
12-Nov-2002 10:26


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".

dpatton.at.confluence.org
02-Oct-2002 06:36


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

strlen

stripslashes

Last updated: Fri, 03 Feb 2012