What is the name of the function in php that determines whether an array exists?

The function in php to determine whether an array exists is called "is_array()". The function of this function is to determine whether a specified variable is an array. The syntax is "is_array($array variable name)"; if it returns true, If false is returned, the specified array does not exist.

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

How to determine whether the array exists in php The function is called "is_array()".

The is_array() function is used to determine whether a specified variable is an array; in other words, it can also determine whether the specified array exists.

is_array($数组变量名)

• If true is returned, the specified array exists, if false is returned, the specified array does not exist.

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
function f($arr){
	if(is_array($arr)){
		echo "数组存在<br>";
	}else{
		echo "数组不存在<br>";
	}
}
$a = array(1,2,3,4,5);
$b = 123;
f($a);
f($b);
?>

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of What is the name of the function in php that determines whether an array exists?. For more information, please follow other related articles on the PHP Chinese website!