stristr

(PHP 4, PHP 5, PHP 7)

stristr대소문자를 구분하지 않는 strstr()

설명

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

haystack에서 첫번째 나타나는 needle부터 마지막까지 반환합니다.

인수

haystack

탐색할 문자열

needle

needle이 문자열이 아니면, 정수로 변환하여 그 값의 문자를 취합니다.

before_needle

TRUE이면 (기본값은 FALSE) stristr()haystack에서 첫 needle 앞 부분을 반환합니다.

needlehaystack은 대소문자를 구분하지 않습니다.

반환값

매치한 문자열 부분을 반환합니다. needle이 발견되지 않으면, FALSE를 반환합니다.

변경점

버전 설명
5.3.0 선택적인 before_needle 인수 추가
4.3.0 stristr()은 바이너리 안전합니다.

예제

Example #1 stristr() 예제

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

Example #2 문자열의 발견 여부 시험하기

<?php
  $string 
'Hello World!';
  if(
stristr($string'earth') === FALSE) {
    echo 
'"earth"를 문자열에서 발견하지 못했습니다.';
  }
// 출력: "earth"를 문자열에서 발견하지 못했습니다.

Example #3 "문자열"이 아닌 needle 사용하기

<?php
  $string 
'APPLE';
  echo 
stristr($string97); // 97 = 소문자 a
// 출력: APPLE
?>

주의

Note: 이 함수는 바이너리 안전입니다.

참고

  • strstr() - 문자열이 처음으로 나오는 부분을 찾습니다
  • strrchr() - 문자열에서 문자가 마지막으로 나오는 부분을 찾습니다
  • substr() - Return part of a string
  • preg_match() - 정규표현식 매치를 수행

add a note add a note

User Contributed Notes 8 notes

up
13
dpatton.at.confluence.org
17 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
5
giz at gbdesign dot net
12 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
2
Techdeck at Techdeck dot org
16 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
-4
notepad at codewalkers dot com
14 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
-6
jukka
5 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
10 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
-13
greg at no_ggmac_reply dot com
8 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
-8
art at awilton dot dotcom
13 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 ~]#
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