Php if strpos true

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Источник

str_contains

Performs a case-sensitive check indicating if needle is contained in haystack .

Parameters

The substring to search for in the haystack .

Return Values

Returns true if needle is in haystack , false otherwise.

Examples

Example #1 Using the empty string »

if ( str_contains ( ‘abc’ , » )) echo «Checking the existence of the empty string will always return true» ;
>
?>

The above example will output:

Checking the existence of the empty string will always return true

Example #2 Showing case-sensitivity

$string = ‘The lazy fox jumped over the fence’ ;

if ( str_contains ( $string , ‘lazy’ )) echo «The string ‘lazy’ was found in the string\n» ;
>

if ( str_contains ( $string , ‘Lazy’ )) echo ‘The string «Lazy» was found in the string’ ;
> else echo ‘»Lazy» was not found because the case does not match’ ;
>

The above example will output:

The string 'lazy' was found in the string "Lazy" was not found because the case does not match

Notes

Note: This function is binary-safe.

User Contributed Notes 7 notes

For earlier versions of PHP, you can polyfill the str_contains function using the following snippet:

// 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 ;
>
>
?>

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 ?: «»`;

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

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];

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);
>

// 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 ;
>
>

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

Источник

How to Check if a String Contains Another Substring in PHP

Monty Shokeen Last updated Feb 26, 2021

A lot of times when I am working with strings in PHP, it becomes important to check if a string contains another substring. PHP has a lot of functions to help you manipulate strings any way you like. We will be using some of these functions today to learn how to check if a string contains a specific substring.

Using New Functions in PHP 8

Three new functions have been added in PHP 8 to help us figure out if a string contains another substring. Please keep in mind that all these functions are case sensitive, and checking for the existence of an empty substring with them will always return true .

str_contains() checks if a string contains a specific substring.
str_ends_with() checks if a string ends with a specific substring.
str_starts_with() checks if a string starts with a specific substring.

$sentence = "Dolphins and Elephants are intelligent animals.";

if(str_contains($sentence, "Elephants"))

echo 'Elephants are intelligent.';

// Elephants are intelligent.

if(str_starts_with($sentence, "Dolphins"))

echo 'Dolphins are intelligent.';

echo 'There is a full stop at the end of the sentence.';

// There is a full stop at the end of the sentence.

As I mentioned earlier, these functions perform a case-sensitive match. You can also perform a case-insensitive match with them by first converting both the string and substring to the same case using strtolower() or strtoupper() .

These functions are ideal if you don’t want to get any extra information about the substrings, like their position. People who need extra information about the match should consider using the functions below.

Using strpos() and stripos()

You can use the PHP strpos() function to get the position of the first occurrence of a substring in a string. The function will return false if it cannot find the substring.

When you use strpos() to check for a substring, make sure that you use the strict inequality operator. This is because the position returned by strpos() starts with 0, and 0 can also equate to false . Using a regular equality check will give you false negatives if the substring is right at the beginning of the main string.

Here are some examples of strpos() :

Источник

Php if strpos true