Php replace null in array

Replacing null values in PHP array

The $value you currently have in if ($value == null) is not the actual array value, but a copy created by foreach .

You should also use a strict null check: if ($value === null)

You should unset the reference after the foreach loop. (See the Warning box in the foreach documentation.)

Another possible way to accomplish this is to use an expression in your query to returns zeroes instead of nulls. That will vary depending on which database you’re using.

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Replace all `null` values in an array in PHP

To replace all occurrences of null in an array with another value you can use the array_map() function that is built into PHP. This function applies a callback function to each item in your array and returns a new array with all the return values of that callback function.

As a first argument array_map() takes the callback function, as a second argument it takes an array of values on which the callback function should be applied.

To replace all null values by another value, the letter «c» in this example, you can take the following snippet:

<?php $REPLACEMENT = 'c'; $values = ['a', 'b', null, 'd']; $result = array_map( fn ($value) => $value ?? $REPLACEMENT, $values ); print_r($result); // Array // ( // [0] => a // [1] => b // [2] => c // [3] => d // ) 

Keep in mind here that in the above snippet I’m using two features that are at the time still fairly recent: the null coalescing operator and an arrow function.

The null coalescing operator returns the first operand, except for when it is null in which case it falls back to the second operand.

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Replace null array value from array in php

I run a query and got id values in an array. Then I push those id like this array_push($id); then I implode ‘,’ into an array and place it in a variable like this $val = implode(«,»,$id); . When I output it i get following result ,2,3,4,5,6,7,8 . Problem in this result is that first value is ‘,’ and it is because first record that I am getting from database is giving me Null value. I want to remove ‘,’ from first place if first record is empty. So that desire result should be 2,3,4,5,6,7,8 .

Please anybody can help me how can I remove ‘,’ from first place. Or any suggestion to solve this problem

Answer

Solution:

$id = array_filter($id, 'ord'); // removes 0 length values, or $id = array_filter($id, 'strlen'); // same as above but a bit slower, or $id = array_filter($id, 'count'); // removes only NULL values and empty arrays $val = implode(",",$id); Copy code

You might also want to consider using is_numeric as the array_filter callback.

Doing just array_filter($id) will remove falsy (like 0 ) elements that you might want.

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