PHP数组array类常见操作示例

<?php
$beginning = 'foo';
$end = array(1 => 'bar');
$result = array_merge((array)$beginning, (array)$end);
print_r($result);
?> 

<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?> 

<?php
$array1 = array();
$array2 = array(1 => "data");
$result = array_merge($array1, $array2);
?> 

<?php
$array1 = array(0 => 'zero_a', 2 => 'two_a', 3 => 'three_a');
$array2 = array(1 => 'one_b', 3 => 'three_b', 4 => 'four_b');
$result = $array1 + $array2;
var_dump($result);
?> 

<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result);
?> 

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?> 

<?php
$array = array(0 => 100, "color" => "red");
print_r(array_keys($array));
 
$array = array("blue", "red", "green", "blue", "blue");
print_r(array_keys($array, "blue"));
 
$array = array("color" => array("blue", "red", "green"),
        "size" => array("small", "medium", "large"));
print_r(array_keys($array));
?>

$input = array("a", "b", "c", "d", "e");
$output = array_slice($input, 2);   // returns "c", "d", and "e"
$output = array_slice($input, -2, 1); // returns "d"
$output = array_slice($input, 0, 3);  // returns "a", "b", and "c"