How to determine case of php array (two methods)

In PHP, there are many ways to determine the case of an array. This article will introduce two of these methods.

Method 1: Use array_change_key_case function

array_change_key_case function returns all the key names of the array in lowercase or uppercase, which can be used to determine the case of the array.

Sample code:

<?php
$arr1 = array("name" => "Tom", "age" => 20);
$arr2 = array("Name" => "Jack", "Age" => 22);

// 将键名全部转成小写
$arr1 = array_change_key_case($arr1, CASE_LOWER);
$arr2 = array_change_key_case($arr2, CASE_LOWER);

var_dump($arr1);
var_dump($arr2);
?>

Output:

array(2) {
  ["name"]=>
  string(3) "Tom"
  ["age"]=>
  int(20)
}

array(2) {
  ["name"]=>
  string(4) "Jack"
  ["age"]=>
  int(22)
}

As you can see, by converting all the key names of the arrays to lowercase, the key names of both arrays become Lowercase.

Method 2: Use strcasecmp function

The strcasecmp function is a case-insensitive function that compares two strings. It can also be used to determine the case of an array.

Sample code:

<?php
$arr1 = array("name" => "Tom", "age" => 20);
$arr2 = array("Name" => "Jack", "Age" => 22);

// 判断两个键名是否相等
if (strcasecmp(key($arr1), key($arr2)) == 0) {
    echo "键名大小写相同！\n";
} else {
    echo "键名大小写不同！\n";
}
?>

Output:

键名大小写相同！

As you can see, by comparing the first key names of the two arrays to see if they are equal, you can determine whether they are case-sensitive. same.

Summary

The above introduces two methods to determine the case of PHP arrays, namely the array_change_key_case function and the strcasecmp function. Which method to choose depends on the specific situation, but in general, the array_change_key_case function is more suitable for batch modifying the case of array key names, and the strcasecmp function is more suitable for comparing whether two key names have the same case.

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