Simply
$os = array("Mac", "NT", "Irix", "Linux");
if (!in_array("BB", $os)) {
echo "BB is not found";
}
user_access_arr) == false)
PHP
php.net › manual › en › function.in-array.php
PHP: in_array - Manual
With PHP8.1, in_array returns boolean false. It took me quite some time to find out what's going on. ... I found out that in_array will *not* find an associative array within a haystack of associative arrays in strict mode if the keys were not generated in the *same order*: <?php $needle = array( 'fruit'=>'banana', 'vegetable'=>'carrot' ); $haystack = array( array('vegetable'=>'carrot', 'fruit'=>'banana'), array('fruit'=>'apple', 'vegetable'=>'celery') ); echo in_array($needle, $haystack, true) ?
how to check element is present in array or not in php ?
how to check element is present in array or not in php ? how to check element is present in array or not in php ? More on youth4work.com
4
0
[SOLVED] Not in array
I'm trying to compare arrays, so i'm checking if an element from array1 is not in array2 and if that happens add that element from array1 to array2 But no matter how i try to write not in it gives me bunch of errors. if (!in_array($svi[$s],$ukupno)) { $ukupno += $svi[$s]; } Fatal error: Unsupport... More on forums.phpfreaks.com
4
December 3, 2008php while not in_array()
Find answers to php while not in_array() from the expert community at Experts Exchange More on experts-exchange.com
Official/Standard way for checking if array is empty
The code of Symfony itself does not use empty to check for empty arrays, and I think the opinion there is to avoid empty wherever possible. The $array === [] is correct, and don't have the weird behavior of empty, if $array is not an array. There is also the count($array) === 0 check, which I think is the best option, as it also works to check if array-like objects are empty, as long as they implement countable (like doctrines collections or ArrayObject). Empty() will always return false for these array-like objects, as the object is non-null. More on reddit.com
89
54
April 17, 2024Videos
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Edureka Community
edureka.co › home › community › categories › web development › php › how to check not in array element
How to check not in array element - PHP
July 28, 2022 - I want to check if an element is not in the array and then want to redirect the page: My code is as ... ) to check it, but I did not get a result.
Itsourcecode
itsourcecode.com › home › not in array php (with advanced program examples)
Not in Array PHP (With Advanced Program Examples)
November 17, 2022 - In simple words, we use the in_array to check if a value in an array exists and use the not in_array (!in_array) to know otherwise. ... Because the boolean parameter has the true or false value, the PHP in_array() function can return either of the following:
W3Schools
w3schools.com › php › func_var_is_array.asp
PHP is_array() Function
This function returns true (1) if the variable is an array, otherwise it returns false/nothing. ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com · If you want ...
GeeksforGeeks
geeksforgeeks.org › php › how-to-check-a-variable-is-an-array-or-not-in-php
How to check a variable is an array or not in PHP ? - GeeksforGeeks
July 23, 2025 - <?php $isArr = "friends"; if(is_array($isArr)) { echo "Array"; } else { echo "Not an Array"; } echo "<br>"; $isArr = array("smith", "john", "josh"); if(is_array($isArr)) { echo "Array"; } else { echo "Not an Array"; } ?> ... Approach 2: By casting the variable to an array. We have to cast the variable to an array that we want to check. ... Example 2: After typecasting, an index-based array will be formed.
Youth4work
youth4work.com › talent › php › forum › how to check element is present in array or not in php ?
how to check element is present in array or not in php ?
$arr = array('raj','ajay','sk'); if(in_array('raj',$arr)) { echo 'element found'; } else { echo 'element not found'; } ... in_array($element,$array_name) eg: <?php $people = array("Peter", "Joe", "Glenn", "Cleveland"); if (in_array("Glenn", $people)) { echo "Match found"; } else { echo "Match not found"; } ?>
PHP Freaks
forums.phpfreaks.com › php coding › php coding help
[SOLVED] Not in array - PHP Coding Help - PHP Freaks
December 3, 2008 - I'm trying to compare arrays, so i'm checking if an element from array1 is not in array2 and if that happens add that element from array1 to array2 But no matter how i try to write not in it gives me bunch of errors. if (!in_array($svi[$s],$ukupno)) { $ukupno += $svi[$s]; } Fatal error: Unsupport...
Experts Exchange
experts-exchange.com › questions › 29179362 › php-while-not-in-array.html
Solved: php while not in_array() | Experts Exchange
April 19, 2020 - I check if() the newly generated account number is in the array What I need to do now in the IF() is to create a loop that adds 1 second to the timestamp and check if its in the array.
Webmaster World
webmasterworld.com › php › 11637.htm
How to test for existance of an array? - PHP Server Side Scripting forum at WebmasterWorld - WebmasterWorld
February 3, 2006 - You can also use is_array, useful if an array is expected, but may not have been set. ... $array = array(); In my case, either the array will be created on the previous page and passed in the header, or it won't. Both situations are legitimate.
GeeksforGeeks
geeksforgeeks.org › php › how-to-check-an-element-is-exists-in-array-or-not-in-php
How to check an element is exists in array or not in PHP ? - GeeksforGeeks
July 23, 2025 - No further modifications in the flag value are made. ... <?php // Declaring an array object $arr = array(1, 3, 5, 6); print("Original Array </br>"); print (json_encode($arr)." </br>"); // Declaring element $ele = 5; // Declare a flag $flag = FALSE; // Check if element exists foreach($arr as $val){ if($flag == FALSE){ if($val == $ele){ $flag = TRUE; } } } if($flag ==TRUE){ print($ele . " - Element found."); } else{ print($ele . " - Element not found."); } ?>
Simple Machines
simplemachines.org › community › index.php
PHP: in_array not working?
October 25, 2010 - Why not lend a hand on our GitHub! Main Menu · Main Menu · Home · Search · Simple Machines Community Forum · ► Customizing SMF · ► SMF Coding Discussion · ► PHP: in_array not working? Started by Matthew K., October 25, 2010, 03:15:35 AM Previous topic - Next topic ·
Quora
quora.com › How-do-I-use-MySQLs-NOT-IN-clause-to-select-records-whose-value-is-“not-in”-a-PHP-array
How to use MySQL's 'NOT IN' clause to select records whose value is “not in” a PHP array - Quora
Answer (1 of 8): You would have to convert the array to a string, because you can’t interpolate an array directly inside a string. We do this in PHP with the [code ]implode()[/code] function. I would also recommend using an array of query parameter placeholders (the [code ]?[/code] symbol), and ...
W3Schools
w3schools.com › php › func_array_in_array.asp
PHP in_array() Function
Loops While Loop Do While Loop For Loop Foreach Loop Break Statement Continue Statement PHP Functions PHP Arrays · Arrays Indexed Arrays Associative Arrays Create Arrays Access Array Items Update Array Items Add Array Items Remove Array Items Sorting Arrays Multidimensional Arrays Array Functions ...
Reddit
reddit.com › r/php › official/standard way for checking if array is empty
r/PHP on Reddit: Official/Standard way for checking if array is empty
April 17, 2024 -
Recently a small disagreement occurred at a code review when my new colleagues used [] === $array for checking if array is empty. I requested a change because I always check for empty array with empty($array) and I have never honestly seen [] === $array used before. I even needed to check if it works as expected.
Their argument was that empty has some loose behavior in some cases but I disagreed because we use PhpStan and in every place it is guaranteed that array and nothing else will ever be passed.
I thought about it and the only objective argument that I could brought up is that it's the only way it was done up to this point and it would be weird to start doing it in some other way. I found this 3 years old post from this subreddit by which it looks like the most preferred/expected way is empty($array).
So my question is: Is there some standard or official rule that clearly states the "best" way to do this? For example PSR standard or standard in Symfony ecosystem or something? Is there some undeniable benefits for one way or another?
edit: user t_dtm in refered post points out interesting argument for count($array) === 0:
it won't require massive refactoring if the array gets replaced with some type of Countable (collection, map, list, other iterable)...
edit2: It seems to me that [] === $array is not futureproof because of collections and \Countable and so on... empty has the same issue. That would point me to the \count($array) === 0 way that doesn't have those problems.
Top answer 1 of 5
35
The code of Symfony itself does not use empty to check for empty arrays, and I think the opinion there is to avoid empty wherever possible. The $array === [] is correct, and don't have the weird behavior of empty, if $array is not an array. There is also the count($array) === 0 check, which I think is the best option, as it also works to check if array-like objects are empty, as long as they implement countable (like doctrines collections or ArrayObject). Empty() will always return false for these array-like objects, as the object is non-null.
2 of 5
31
if (!$array) {} https://github.com/symfony/symfony/pull/54447 Readable, concise, works with nulls, strings etc. so it's consistent. And you can use it together with ?: operator.
Top answer 1 of 2
8
Use preg_grep like so:
if (in_array("Notecards", $array) || preg_grep("/Poster\s\d+/", $array)){
echo "Match found";
}else{
echo "Match not found";
}
I took the liberty of assuming that you might have more than Posters 0-9, in which case \d+ matches one or more digits (Poster 10, Poster 800, etc.). If you only require one digit, remove the +.
2 of 2
0
This is one solution:
if (in_array("Notecards", $array) || substr_in_array("Poster", $array)){
echo "Match found";
}else{
echo "Match not found";
}
substr_in_array($str, $array){
$length = strlen($str);
foreach($array as $value){
if(substr($value, 0, $length) == $str){
return true;
}
}
return false;
}
Top answer 1 of 3
38
You can use array_diff() to compute the difference between two arrays:
$array1 = array(1, 2, 3, 4, 5);
$array2 = array(2, 4, 5);
$array3 = array_diff($array1, $array2);
print_r($array3);
Output:
Array
(
[0] => 1
[2] => 3
)
Demo!
2 of 3
1
$array1 = array(1, 2, 3, 4, 5);
$array2 = array(2, 4, 5);
$result = array_diff($array1, $array2);
Medium
medium.com › @erlandmuchasaj › isset-vs-array-key-exists-b5b054f63eea
isset() vs array_key_exists(). For most of my PHP career, I’ve used… | by Erland Muchasaj | Medium
April 11, 2023 - But in PHP there are other ways that you can check for variables in arrays, and some of them are also in_array and array_key_exists isset() is a built-in function in PHP that determines if a variable…