How to remove numeric elements from php array

Removal steps: 1. Use the foreach statement to traverse the array, the syntax is "foreach ($array as $k => $v){//Loop body statement block;}"; 2. In the loop body, Use is_numeric() to determine whether the element is a number. If so, use the unset() function to delete it. The syntax is "if (is_numeric($v)) {unset($arr[$k]);}".

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

In PHP, you can use the foreach statement and is_numeric () and unset() functions to remove numeric elements from an array.

Implementation steps:

Step 1. Use the foreach statement to traverse the array

foreach ($array as $k => $v){
    //循环体语句块;
}

• Traverse to A certain $arr array, in each loop, the value of the current array will be assigned to $v, and the key name will be assigned to $k.

Step 2: In the loop body, use is_numeric() to determine whether the element is a number. If so, use the unset() function to delete it

• is_numeric() function is used to detect whether a variable is a number or a numeric string. If the specified variable is a number or numeric string, it returns TRUE, otherwise it returns FALSE. Note that floating point type returns 1, which is TRUE.

• The unset() function is used to destroy the given variable.

if (is_numeric($v)) {
unset($arr[$k]);
}

Implementation example code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
function f($arr) {
	foreach ($arr as $k => $v) {
		if (is_numeric($v)) {
			unset($arr[$k]);
		}
	}
	echo "去除数字元素后";
	var_dump($arr);
}

$arr = array(1,2,"3","hello",null,&#39;&#39;,"b");
var_dump($arr);
f($arr);
?>

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