str_contains

(PHP 8)

str_containsBir dizge içinde belirtilen alt dizgeyi arar

Açıklama

str_contains(string $samanlık, string $iğne): bool

samanlık dizgesine harf büyüklüğüne duyarlı bir arama uygulayıp içinde iğne arar.

Bağımsız Değişkenler

samanlık

Araştırılacak dizge.

iğne

Aranacak dizge.

Dönen Değerler

samanlık dizgesi içinde needle varsa true, başarısızlık durumunda false döner.

Örnekler

Örnek 1 - Boş dizge '' kullanımı

<?php
if (str_contains('abc', '')) {
echo
"Boş dize araması her zaman doğru sonuç verir";
}
?>

Yukarıdaki örneğin çıktısı:

Boş dize araması her zaman doğru sonuç verir

Örnek 2 - Harf büyüklüğüne duyarlılık

<?php
$string
= 'The lazy fox jumped over the fence';

if (
str_contains($string, 'lazy')) {
echo
"Dizgenin içinde 'lazy' var\n";
}

if (
str_contains($string, 'Lazy')) {
echo
'Dizgenin içinde "Lazy" bulundu';
} else {
echo
'"Lazy" yok çünkü harf büyüklüğü eşleşmedi';
}

?>

Yukarıdaki örneğin çıktısı:

Dizgenin içinde 'lazy' var
"Lazy" yok çünkü harf büyüklüğü eşleşmedi

Notlar

Bilginize: Bu işlev ikil dosyalarla çalışırken dosya içeriğini değiştirmez.

Ayrıca Bakınız

  • str_ends_with() - Bir dizge belirtilen alt dizge ile bitiyor mu diye bakar
  • str_starts_with() - Bir dizge belirtilen alt dizge ile başlıyor mu diye bakar
  • stripos() - Harf büyüklüğüne duyarsız olarak bir alt dizgenin ilkinin konumunu bulur
  • strrpos() - Bir dizgede bir karakterin sonuncusunu bulur
  • strripos() - Bir dizgede harf büyüklüğüne duyarsız olarak bir alt dizgenin sonuncusunu bulur
  • strstr() - İlk alt dizgeyi bulur
  • strpbrk() - Belirtilen karakterleri bir dizge içinde arar
  • substr() - Dizgenin bir kısmını döndürür
  • preg_match() - Bir düzenli ifadeyi eşleştirmeye çalışır

add a note

User Contributed Notes 9 notes

up
106
scm6079
3 years ago
For earlier versions of PHP, you can polyfill the str_contains function using the following snippet:

<?php
// based on original work from the PHP Laravel framework
if (!function_exists('str_contains')) {
function
str_contains($haystack, $needle) {
return
$needle !== '' && mb_strpos($haystack, $needle) !== false;
}
}
?>
up
13
aisunny7 dot xy at gmail dot com
2 years ago
The polyfill that based on original work from the PHP Laravel framework had a different behavior;

when the $needle is `""` or `null`:
php8's will return `true`;
but, laravel'str_contains will return `false`;

when php8.1, null is deprecated, You can use `$needle ?: ""`;
up
5
harl at gmail dot com
11 months ago
A couple of functions for checking if a string contains any of the strings in an array, or all of the strings in an array:

<?php
function str_contains_any(string $haystack, array $needles): bool
{
return
array_reduce($needles, fn($a, $n) => $a || str_contains($haystack, $n), false);
}

function
str_contains_all(string $haystack, array $needles): bool
{
return
array_reduce($needles, fn($a, $n) => $a && str_contains($haystack, $n), true);
}
?>

str_contains_all() will return true if $needles is an empty array. If you think that's wrong, show me a string in $needles that DOESN'T appear in the $haystack, and then look up "vacuous truth".

(By swapping haystacks and needles in the body of these functions you can create versions that check if a needle appears in any/all of an array of haystacks.)
up
2
Ancyker
10 months ago
This function doesn't always produce the expected results if you have a needle that isn't UTF-8 but are looking for it in a UTF-8 string. This won't be a concern for most people, but if you are mixing old and new data, especially if reading data from a file, it could be an issue.

Here's a "mb_*"-esque function that searches the string:

<?php
function mb_str_contains(string $haystack, string $needle, $encoding = null) {
return
$needle === '' || mb_substr_count($haystack, $needle, (empty($encoding) ? mb_internal_encoding() : $encoding)) > 0;
}
?>

I used mb_substr_count() instead of mb_strpos() because mb_strpos() will still match partial characters as it's doing a binary search.

We can compare str_contains to the above suggested function:

<?php
// Some Unicode Kanji (漢字はユニコード)
$string = hex2bin('e6bca2e5ad97e381afe383a6e3838be382b3e383bce38389');

// Some Windows-1252 characters (ãƒ)
$contains = hex2bin('e383');
// ^ file_get_contents() produces the same data when it is saved as "ANSI" in Notepad on Windows, so this is not that unrealistic. The only reason to use hex2bin here is to mix character sets without having to use multiple files.

// A character that actually exists in our string. (ー)
$contains2 = hex2bin('e383bc');

echo
" = Haystack: ".var_export($string, true)."\r\n";
echo
" = Needles:\r\n";
echo
" + Windows-1252 characters\r\n";
echo
" - Results:\r\n";
echo
" > str_contains: ".var_export(str_contains($string, $contains), true)."\r\n";
echo
" > mb_str_contains: ".var_export(mb_str_contains($string, $contains), true)."\r\n";
echo
" + Valid UTF-8 character\r\n";
echo
" - Results:\r\n";
echo
" > str_contains: ".var_export(str_contains($string, $contains2), true)."\r\n";
echo
" > mb_str_contains: ".var_export(mb_str_contains($string, $contains2), true)."\r\n";
echo
"\r\n";
?>

Output:

= Haystack: '漢字はユニコード'
= Needles:
+ Windows-1252 characters
- Results:
> str_contains: true
> mb_str_contains: false
+ Valid UTF-8 character
- Results:
> str_contains: true
> mb_str_contains: true

It's not completely foolproof, however. For instance, ド in Windows-1252 will match ド from the above string. So it's still best to convert the encoding of the parameters to be the same first. But, if the character set isn't known/can't be detected and you have no choice but to deal with dirty data, this is probably the simplest solution.
up
2
olivertasche+nospam at gmail dot com
3 years ago
The code from "me at daz dot co dot uk" will not work if the word is
- at the start of the string
- at the end of the string
- at the end of a sentence (like "the ox." or "is that an ox?")
- in quotes
- and so on.

You should explode the string by whitespace, punctations, ... and check if the resulting array contains your word OR try to test with a RegEx like this:
(^|[\s\W])+word($|[\s\W])+

Disclaimer: The RegEx may need some tweaks
up
1
juliyvchirkov at gmail dot com
2 years ago
<?php

// Polyfill for PHP 4 - PHP 7, safe to utilize with PHP 8

if (!function_exists('str_contains')) {
function
str_contains (string $haystack, string $needle)
{
return empty(
$needle) || strpos($haystack, $needle) !== false;
}
}
up
-1
drupalista dot com dot br at gmail dot com
2 years ago
private function contains(array $needles, string $type, string $haystack = NULL, string $filename = NULL) : bool {
if (empty($needles)) return FALSE;
if ($filename)
$haystack = file_get_contents($filename);

$now_what = function(string $needle) use ($haystack, $type) : array {
$has_needle = str_contains($haystack, $needle);
if ($type === 'any' && $has_needle)
return ['done' => TRUE, 'return' => TRUE];

if ($type === 'all' && !$has_needle)
return ['done' => TRUE, 'return' => FALSE];

return ['done' => FALSE];
};

foreach ($needles as $needle) {
$check = $now_what($needle);
if ($check['done'])
return $check['return'];
}
return TRUE;
}

function containsAny(array $needles, string $haystack = NULL, string $filename = NULL) : bool {
return self::contains($needles, 'any', $haystack, $filename);
}

function containsAll(array $needles, string $haystack = NULL, string $filename = NULL) : bool {
return self::contains($needles, 'all', $haystack, $filename);
}
up
-10
AuxData
2 years ago
Until PHP 8 was released, many-a-programmer were writing our own contain() functions. Mine also handles needles with logical ORs (set to '||').
Here it is.

function contains($haystack, $needle, $offset){
$OR = '||';
$result = false;

$ORpos = strpos($needle, $OR, 0);
if($ORpos !== false){ //ORs exist in the needle string
$needle_arr = explode($OR, $needle);
for($i=0; $i < count($needle_arr); $i++){
$pos = strpos($haystack, trim($needle_arr[$i]), $offset);
if($pos !== false){
$result = true;
break;
}
}
} else {
$pos = strpos($haystack, trim($needle), $offset);
if($pos !== false){
$result = true;
}
}
return($result);
}

Call: contains("Apple Orange Banana", "Apple || Walnut", 0);
Returns: true
up
-53
kadenskinner at gmail dot com
3 years ago
<?php

$needle
= '@';
$haystack = 'user@example.com';

if (!
str_contains($haystack, $needle)){
echo
'There is not an @ in haystack';
}else{
echo
'There is an @ in haystack';
}
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