What functions in PHP can be used to compare array keys for consistency?

When comparing array keys for consistency in PHP, you can use the `array_keys()` function to extract the keys from an array and then compare them using functions like `array_diff()` or `array_intersect()` to check for consistency. These functions allow you to compare keys across multiple arrays and determine if they match or differ. 

$array1 = ['a' => 1, 'b' => 2, 'c' => 3];
$array2 = ['a' => 4, 'b' => 5, 'c' => 6];

$keys1 = array_keys($array1);
$keys2 = array_keys($array2);

if(array_diff($keys1, $keys2) || array_diff($keys2, $keys1)){
    echo "Array keys are not consistent.";
} else {
    echo "Array keys are consistent.";
}

Keywords

array_keys array_diff array_intersect array_key_exists array_diff_key

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