stripslashes
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'
Descripción
Devuelve todo de haystack desde la primera aparición de needle hasta el final.
Parámetros
- haystack
-
El string en donde buscar
- needle
-
Si needle no es un string, se convierte a un integer y se aplica como el valor ordinal de un caracter.
- before_needle
-
Si es TRUE, stristr() devuelve la parte del haystack anterior a la primera aparición del needle.
needle y haystack se examinan de una manera insensible a mayúsculas y minúsculas.
Valores devueltos
Devuelve el substring coincidente. Si no se encuentra needle, devuelve FALSE.
Historial de cambios
| Versión | Descripción |
|---|---|
| 5.3.0 | Agregado el parámetro opcional before_needle. |
| 4.3.0 | stristr() se hizo seguro a nivel binario. |
Ejemplos
Example #1 Ejemplo de stristr()
<?php
$email = 'USER@EXAMPLE.com';
echo stristr($email, 'e'); // salida ER@EXAMPLE.com
echo stristr($email, 'e', true); // A partir de PHP 5.3.0, salida US
?>
Example #2 Probando si un string se encuentra o no
<?php
$string = 'Hello World!';
if(stristr($string, 'earth') === FALSE) {
echo '"earth" not found in string';
}
// salida: "earth" not found in string
?>
Example #3 Utilizando un needle no "string"
<?php
$string = 'APPLE';
echo stristr($string, 97); // 97 = a minúscula
// salida: APPLE
?>
Notas
Note: Esta función es segura binariamente.
Ver también
- strstr() - Buscar la primera aparición de una cadena
- strrchr() - Encuentra la última aparición de un caracter en un string
- substr() - Devuelve parte de una cadena
- preg_match() - Realiza una comparación con una expresión regular
add a note
User Contributed Notes
stristr
greg at no_ggmac_reply dot com
13-Jan-2011 09:20
jahforlove at gmail dot com
16-Oct-2010 05:58
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 05:44
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, $search_needle) != FALSE) {
echo 'execute this code if found';
}
}
?>
carel at ckbt dot org
13-May-2009 03:18
if stristr($message,'viagra')
or stristr($message,'cialis')
)
{
die();
}
Works quite well in any Shoutbox, Forum, Guestbook, Mailform, etcetera.
Just enter between the definitions and sending the message to the DB, et voila. ^_^
tomas dot nesrovnal at yourspirit dot cz
18-Dec-2008 08:36
Active item item in menu:
<?php
function aim($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 12:02
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 05:17
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 12:39
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
05-Jun-2005 08:02
<?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 08:26
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
03-Oct-2002 04:36
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