stripos

(PHP 5, PHP 7)

stripos대소문자를 구분 없이 문자열이 처음 나타나는 위치를 탐색

설명

int stripos ( string $haystack , string $needle [, int $offset ] )

haystack string에서 needle이 처음 나타나는 위치를 반환합니다.

strpos()와 달리, stripos()는 대소문자를 구분하지 않습니다.

인수

haystack

검색할 문자열

needle

needle는 한 문자 이상의 문자열이여야 합니다.

needle이 문자열이 아니라면, 정수로 변환하여 해당하는 값의 문자를 적용합니다.

offset

선택적인 offset 인수로 haystack의 몇번째 문자에서 검색을 시작할지 지정할 수 있습니다. 반환하는 위치는 haystack의 처음부터 세어집니다.

반환값

needle을 발견하지 못하면, stripos()boolean FALSE를 반환합니다.

Warning

이 함수는 논리 FALSE를 반환하지만, 논리 FALSE로 취급할 수 있는 다른 값을 반환할 수 있습니다. 자세한 정보는 논리형 섹션을 참고하십시오. 이 함수의 반환값을 확인하려면 === 연산자를 이용하십시오.

예제

Example #1 stripos() 예제

<?php
$findme    
'a';
$mystring1 'xyz';
$mystring2 'ABC';

$pos1 stripos($mystring1$findme);
$pos2 stripos($mystring2$findme);

// 'a'는 'xyz' 안에 없습니다.
if ($pos1 === false) {
    echo 
"문자열 '$findme'은 문자열 '$mystring1'에서 발견할 수 없습니다.";
}

// ===를 사용하는 점에 주의하십시오. ==는 'a'가 0번째
// (처음) 문자기에, 기대하는대로 작동하지 않습니다.
if ($pos2 !== false) {
    echo 
"'$findme'를 '$mystring2' 위치 $pos2에서 찾았습니다.";
}
?>

주의

Note: 이 함수는 바이너리 안전입니다.

참고

  • strpos() - 문자열이 처음 나타나는 위치를 찾습니다
  • strrpos() - 문자열에서 마지막 문자의 위치를 찾습니다
  • strrchr() - 문자열에서 문자가 마지막으로 나오는 부분을 찾습니다
  • substr() - Return part of a string
  • stristr() - 대소문자를 구분하지 않는 strstr
  • strstr() - 문자열이 처음으로 나오는 부분을 찾습니다
  • stripos()
  • str_ireplace() - 대소문자 구분 없는 str_replace

add a note add a note

User Contributed Notes 8 notes

up
30
emperorshishire at gmail dot com
10 years ago
I found myself needing to find the first position of multiple needles in one haystack.  So I wrote this little function:

<?php
function multineedle_stripos($haystack, $needles, $offset=0) {
    foreach(
$needles as $needle) {
       
$found[$needle] = stripos($haystack, $needle, $offset);
    }
    return
$found;
}

// It works as such:
$haystack = "The quick brown fox jumps over the lazy dog.";
$needle = array("fox", "dog", ".", "duck")
var_dump(multineedle_stripos($haystack, $needle));
/* Output:
   array(3) {
     ["fox"]=>
     int(16)
     ["dog"]=>
     int(40)
     ["."]=>
     int(43)
     ["duck"]=>
     bool(false)
   }
*/
?>
up
2
spam at kleppinger dot com
4 years ago
Regarding the function by spam at wikicms dot org

It is very bad practice to use the same function name as an existing php function but have a different output format.  Someone maintaining the code in the future is likely to be very confused by this.  It will also be hard to eradicate from a codebase because the naming is identical so each use of stripos() would have to be analyzed to see how it is expecting the output format (bool or number/bool).

Calling it string_found() or something like that would make a lot more sense for long-term use.
up
1
sorrynorealemail at example dot com
1 year ago
Unlike strpos() it seems that stripos() does NOT issue a WARNING if the needle is an empty string ''.
up
-1
emanuel dot karlsson at rolfsbuss dot se
1 year ago
Finding numbers in strings requires you to cast the number to string first.

strpos("123", 2) !== strpos("123", "2")
up
-1
Ian Macdonald
3 years ago
Regarding the === note, it might be worth clarifying that the correct tests for a binary found/not found condition are  !==false to detect found, and ===false to detect not found.
up
-13
steve at opilo dot net
6 years ago
A handy function if you need to adjust layout based on whether or not a string contains descending letters:

<?php function containsDescenders($text) {
   
$descenders = array("g","j","p","q","y");
    foreach (
$descenders as $letter) {
        if (
stripos($text,$letter) !== false) {
            return
true;
        }
    }
    return
false;
}
?>
up
-15
grf at post dot cz
12 years ago
this would to work with any language, i hope.
tested on czech (eastern europe) lang.

<?php
/****************************************
*    SAFE HIGHLIGHT
****************************************/
/**
* function finds and encase every string in a $needleArr array with
* strings $shearLft (from the left side) and $shearRgt (guess from which
* side).
* already encased needles are IGNORED for any other step, so order
* of needles in $needleArr is pretty important.
*
* function is searching needles in case-insensitive mode,
* but case in the subject is saved.
*
* can you do it better? so, do it.
*
* @param array $needleArr array of needles
* @param string $shearLft left shear
* @param string $shearRgt right shear
* @param string $subject subject
* @param string $encoding encoding ('utf-8' is default)
*
* @author griffin
*/
function safeHighlight( $needleArr, $shearLft, $shearRgt, $subject, $encoding = 'utf-8')
{
   
   
// encoding
   
$e = $encoding;
   
   
// oh, no needles
   
if( !is_array( $needleArr))
        return
$subject;
       
   
// empty keys throw-off, only unique, reindex
   
$nA = array_values(
           
array_unique(
               
array_diff( $needleArr, array(''))
            )
        );
   
   
// needle count
   
if( !($nC = count( $nA)))
        return
$subject; // nothing to hl
       
    // shear length
   
if( !(($rLL = mb_strlen( $rL = $shearLft, $e))
    + (
$rRL = mb_strlen( $rR = $shearRgt, $e))))
        return
$subject; // no shears
   
    // subject length
   
if( !($sL = mb_strlen( $s = $subject, $e)))
        return
null; // empty subject
       
    // subject in lowercase (we need to aviod
    // using mb_stripos due to PHP version)
   
$sW = mb_strtolower( $s, $e);
   
   
// masking ~ 0=not changed, 1=changed
   
$m = str_repeat( '0', $sL);
   
   
// loop for each needle
   
for( $n=0; $n<$nC; $n++)
    {
       
       
// needle string loWercase
       
$nW = mb_strtolower( $nA[ $n], $e);
       
       
$o = 0; // offset
       
$nL = mb_strlen( $nW, $e); // needle length

        // search needle
       
while( false !== ($p = mb_strpos( $sW, $nW, $o, $e)))
        {
           
// oh hurrey, needle found on $p position
           
            // is founded needle already modified? (in full-length)
           
for( $q=$p; $q<($p+$nL); $q++)
                if(
$m[ $q])
                {
                   
// ai, caramba. already modified, jump over
                   
$o+= $nL;
                   
                   
// continue for while() loop - not for for() loop!
                   
continue 2;
                }
           
           
// explode subject and mask into three parts
            // partA|needle|partB
           
$sE[0] = mb_substr( $s, 0, $p, $e);
           
$sE[1] = mb_substr( $s, $p, $nL, $e);
           
$sE[2] = mb_substr( $s, $p+$nL, $sL-$p-$nL, $e);
           
           
// mask
            // partA|partB (needle not needed)
           
$mE[0] = mb_substr( $m, 0, $p, $e);
           
$mE[1] = mb_substr( $m, $p+$nL, $sL-$p-$nL, $e);
           
           
// apply shears
           
$sE[1] = $rL.$sE[1].$rR;
           
           
// update sunject length
           
$sL+= $rLL + $rRL;
           
           
// update mask
           
$m = $mE[0] . str_repeat( '1', $rLL + $nL + $rRL) . $mE[1];
           
           
// implode into a subject
           
$s = implode( $sE);
           
           
// update lowercase subject
           
$sW = mb_strtolower( $s, $e);
           
           
// increase offset
           
$o+= $rLL + $nL + $rRL;
           
           
// end of string reached
           
if( $o>=$sL)
                break;
           
        }
// while()
       
   
} // for( $n=0; $n<$nC; $n++)
   
    // oouu yeaaa, kick the subject out of the function
   
return $s;
   
}
// function safeHighlight()
/****************************************
*    END: SAFE HIGHLIGHT
****************************************/
?>
up
-17
spam at wikicms dot org
5 years ago
If you like using ternary operator, I wrote simple example how to use stripos function.
Also, in my example I add "How to use namespaces" for wide knowledges for newbies.

<?php
namespace My;

//You can be free using core functions in your NameSpaces (My)
function stripos($haystack, $needle) {
   
//To call core function (from global NS) you should add backslash only - \func
   
return (FALSE === \stripos($haystack, $needle)) ? FALSE : TRUE;
}

var_dump(stripos($haystack = 'John knows English language.', $needle = 'john')); //TRUE
var_dump(stripos($haystack = 'Sara knows English language too.', $needle = 'john')); //FALSE
?>
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