How to remove null values ​​from php array

Method: 1. Loop through the array with the syntax "foreach($arr as $k=>$v){}"; 2. In the loop body, use "==" to determine whether the element value is null. , if so, use unset() to delete the element, the syntax is "if($v==null){unset($arr[$k]);}".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

Remove null from the php array Value method

Implementation method:

• Use the foreach statement to loop through the array

• In the loop body, determine whether the array element is null. If so, use unset() to delete the element.

  unset() function is used to destroy the given variable, unset($ arr[$key]).
  

Implementation example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr = array(1,2,null," ",null,"",3,4);
var_dump($arr);
foreach ($arr as $key => $value){
	if($value==null){
		unset($arr[$key]);
	}
}
var_dump($arr);
?>

##Expand knowledge:

• Syntax format 1:

foreach ($array as $value){
    语句块;
}

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$array Array, assign the value of the current array to $value in each loop.

• Syntax format 2:

foreach ($array as $key => $value){
    语句块;
}

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Traverse the given

$array array, and in each loop The value of the current array is assigned to $value, and the key name is assigned to $key.

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