What are the differences between in_array and array_search functions in PHP when searching for elements in an array?

The main difference between the `in_array` and `array_search` functions in PHP is that `in_array` simply checks if a value exists in an array and returns a boolean (true or false), while `array_search` not only checks if a value exists in an array but also returns the corresponding key/index if found. Therefore, if you only need to know if a value exists in an array, use `in_array`, but if you need to know the key/index of the value, use `array_search`. 

// Using in_array
$array = [1, 2, 3, 4, 5];
$value = 3;

if (in_array($value, $array)) {
    echo "Value exists in the array";
} else {
    echo "Value does not exist in the array";
}

// Using array_search
$array = [1, 2, 3, 4, 5];
$value = 3;

$key = array_search($value, $array);

if ($key !== false) {
    echo "Value exists at index: " . $key;
} else {
    echo "Value does not exist in the array";
}

Keywords

in_array array_search PHP array elements

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