PHP 8.3.4 Released!

stristr

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

stristrCase-insensitive strstr()

Descrição

stristr(string $haystack, string $needle, bool $before_needle = false): string|false

Returns all of haystack starting from and including the first occurrence of needle to the end.

Parâmetros

haystack

The string to search in

needle

The string to search for.

Antes do PHP 8.0.0, se needle não for uma string, ela será convertida para um número inteiro e aplicada como o valor ordinal de um caractere. Este comportamento tornou-se defasado a partir do PHP 7.3.0 e depender dele é altamente desaconselhado. Dependendo do comportamento pretendido, o parâmetro needle deve ser explicitamente convertido em string ou uma chamada explícita para chr() deve ser realizada.

before_needle

If true, stristr() returns the part of the haystack before the first occurrence of the needle (excluding needle).

needle and haystack are examined in a case-insensitive manner.

Valor Retornado

Returns the matched substring. If needle is not found, returns false.

Registro de Alterações

Versão Descrição
8.2.0 A redução de todas as letras a maiúsculas ou minúsculas não depende mais da localidade definida com setlocale(). Somente a redução de todas as letras ASCII a maiúsculas ou minúsculas será feita. Os bytes não ASCII serão comparados por seu valor de byte.
8.0.0 O parâmetro needle agora aceita uma string vazia.
8.0.0 Passing an int as needle is no longer supported.
7.3.0 Passing an int as needle has been deprecated.

Exemplos

Exemplo #1 stristr() example

<?php
$email
= 'USER@EXAMPLE.com';
echo
stristr($email, 'e'); // outputs ER@EXAMPLE.com
echo stristr($email, 'e', true); // outputs 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() - Find the first occurrence of a string
  • strrchr() - Find the last occurrence of a character in a string
  • stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
  • strpbrk() - Procura na string por um dos caracteres de um conjunto
  • preg_match() - Perform a regular expression match

add a note

User Contributed Notes 8 notes

up
16
dpatton.at.confluence.org
21 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
7
giz at gbdesign dot net
16 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
21 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
-2
notepad at codewalkers dot com
18 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
9 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
up
-10
tomas dot nesrovnal at yourspirit dot cz
15 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>';
?>
up
-9
art at awilton dot dotcom
18 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
-15
greg at no_ggmac_reply dot com
13 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'
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