Answers for "array_key_exists in multidimensional array php"

array_key_exists vs in_array

in_array() v/s array_key_exists()
Difference:

in_array() checks if a value exists in an array (checks the values, not the keys) and returns true, or false otherwise.
while:

array_key_exists() checks if the given key or index exists in the array (checks in keys, not in values) and returns true, or false otherwise.
Visits the manual (links above) for examples and more information.

php check if value exists in multidimensional array

// 1d array
in_array('something', $array);

// 2d array
array_column($multi_array, 'your_column');

/**
0 => ['hi'=>0, 'your_column'=>1, 'hi'=>0, 'your_column'=>3]
will be
[1, 3]
and then you can apply the in_array function on that new array ^
*/