How to remove negative numbers from php array

Method: 1. Use foreach to traverse the array, the syntax is "foreach($arr as $k=>$v){}"; 2. In the loop body, determine whether the array element "$v" is Negative number, if it is a negative number, use unset() to delete it, the syntax is "if($v

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php array removal of negative numbers Method

#1. Use the foreach statement to traverse the array

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

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

2. In the loop body, remove negative numbers

In the loop body, determine whether the array element value is a negative number (that is, whether it is less than 0). If it is a negative number, Then use unset() to delete the element.

if($value<0){
	unset($array[$key]);
}

Implementation code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr = [3,-1,4,6,-5,7,-3];
var_dump($arr);
foreach($arr as $k=>$v){
	if($v<0){
		unset($arr[$k]);
	}
}
var_dump($arr);
?>

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