php数组常用函数有哪些方法

$array1 = array("a" => "red", "b" => "green", "c" => "blue");$array2 = array("a" => "red", "b" => "blue", "c" => "green");$result = array_diff($array1, $array2);print_r($result);

Array( [b] => green [c] => blue )

$colors = array("red", "green");array_push($colors, "blue");print_r($colors);

Array( [0] => red [1] => green [2] => blue )

$colors = array("red", "green", "blue");$last_color = array_pop($colors);print_r($colors);echo "last color: " . $last_color;

Array( [0] => red [1] => green )last color: blue

$colors = array("red", "green", "blue");$first_color = array_shift($colors);print_r($colors);echo "first color: " . $first_color;

Array( [0] => green [1] => blue )first color: red

$colors = array("red", "green");array_unshift($colors, "yellow");print_r($colors);

Array( [0] => yellow [1] => red [2] => green )

$colors = array("red", "green", "blue", "yellow", "black");$subset = array_slice($colors, 0, 2);print_r($subset);

Array( [0] => red [1] => green )

$colors = array("red", "green", "blue", "yellow", "black");array_splice($colors, 0, 2, array("orange", "purple"));print_r($colors);

Array( [0] => orange [1] => purple [2] => blue [3] => yellow [4] => black )

$array1 = array("a" => "red", "b" => "green");$array2 = array("c" => "blue", "d" => "yellow");$result = array_merge($array1, $array2);print_r($result);

Array( [a] => red [b] => green [c] => blue [d] => yellow )

$colors = array("a" => "red", "b" => "green", "c" => "blue");if (array_key_exists("b", $colors)) {    echo "Key exists!";} else {    echo "Key does not exist!";}

Key exists!

$colors = array("red", "green", "blue");if (in_array("green", $colors)) {    echo "Value exists!";} else {    echo "Value does not exist!";}

Value exists!