How to traverse a php array and remove specified values

Method: 1. Use the "foreach($arr as $key=>$value)" statement to traverse the array; 2. Use the "if($value==="specified value")" statement to determine the current Whether the array value is a value that needs to be removed, if so, use the "unset($arr[$key])" statement to delete the element.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php array traversal move Except the specified value

Implementation idea:

• In PHP, if you want to traverse the array, you can use the foreach statement;

• In the loop body, use the if statement and the "===" operator to determine whether the current array value is the specified value

  If so, use unset() The function can delete the element
  

Implementation code:

<?php
$arr=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
var_dump($arr);
foreach($arr as $key=>$value){
	if($value==="blue"){
		unset($arr[$key]);
	}
}
var_dump($arr);
?>

Output result:

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