PHP array introductory tutorial array_key_exists() function

This article introduces the usage of the array_key_exists() function of the PHP array function. Friends in need can refer to it.

In the php array function, the function array_key_exists() implements this function: Returns true if a specified key is found in an array, false otherwise.

The form is as follows: boolean array_key_exists(mixed key,array array);

Example, search for apple in the array key, if found, the color of this fruit will be output:

<?php
//array_key_exists函数用法举例
//by bbs.it-home.org
$fruit["apple"] = "red";  
$fruit["banana"] = "yellow";  
$fruit["pear"] = "green";  
if(array_key_exists("apple", $fruit)){  
printf("apple's color is %s",$fruit["apple"]);  
}  
  
//apple's color is red
?>