How to check how many values ​​an array has in php

Method: 1. Create a counter variable and set the value to 0; 2. Loop through the array with the syntax "foreach($arr as $v)"; 3. In the loop body, determine whether the element is a numeric value. If If so, the counter will be incremented by 1, syntax if(is_numeric($v)){$n;}"; 4. The loop ends and the counter will be output.

This tutorial Operating environment: Windows 7 system, PHP version 7.1, DELL G3 computer

How does php check how many values ​​an array has?

php checks one The array has several values. Calculate the number of numerical elements in the statistical array.

Implementation method:

• Create and initialize a counter variable, The value is set to 0 for counting.

• Use foreach loop to traverse the array

• In the loop body, use the is_numeric function to determine whether the array element is is a numerical value; if it is a numerical value, the counter will increment by 1.

• The loop ends and the counter is output.
  

Implementation code :

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr= array(1,"a",3,"b",5,"cc",7,"d",null,10);
var_dump($arr);
$n=0;
foreach($arr as $v){
	if(is_numeric($v)){
		$n++;
	}
}
echo "数值元素有： ".$n." 个";
?>

It can be seen that there are 5 numerical elements in the array.

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