本文实例讲述了PHP数组array类常见操作。分享给大家供大家参考，具体如下：
array_merge($arr1,$arr2....);//合并一个或多个数组
例：
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<?php
$beginning = 'foo';
$end = array(1 => 'bar');
$result = array_merge((array)$beginning, (array)$end);
print_r($result);
?>
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以上例程会输出：
Array
(
[0] => foo
[1] => bar
)
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<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>
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以上例程会输出：
Array
(
[color] => green
[0] => 2
[1] => 4
[2] => a
[3] => b
[shape] => trapezoid
[4] => 4
)
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<?php
$array1 = array();
$array2 = array(1 => "data");
$result = array_merge($array1, $array2);
?>
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别忘了数字键名将会被重新编号！
Array
(
[0] => data
)
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<?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);
?>
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运行结果：
array(5) {
[0]=>
string(6) "zero_a"
[2]=>
string(5) "two_a"
[3]=>
string(7) "three_a"
[1]=>
string(5) "one_b"
[4]=>
string(6) "four_b"
}
array_diff($arr1,$arr2);//计算数组的差集（对比返回在 array1 中但是不在 array2 及任何其它参数数组中的值。）
例：
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<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result);
?>
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在 $array1 中多次出现的值一样处理，输出结果为：
Array
(
[1] => blue
)
array_diff_assoc（$arr1,$arr2...）；//带索引检查计算数组的差集
array_diff_assoc() 返回一个数组，该数组包括了所有在 array1 中但是不在任何其它参数数组中的值
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<?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);
?>
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以上例程会输出：
Array
(
[b] => brown
[c] => blue
[0] => red
)
array_keys($array);//返回数组中部分的或所有的键名(返回 input 数组中的数字或者字符串的键名。)
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<?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));
?>
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以上例程会输出：
Array
(
[0] => 0
[1] => color
)
Array
(
[0] => 0
[1] => 3
[2] => 4
)
Array
(
[0] => color
[1] => size
)
array_slice($array, $offset, $length);//从数组中取出一段
参数：array::输入的数组， offset：序列偏移量， length:单元长度
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$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"
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希望本文所述对大家PHP程序设计有所帮助。
原文链接：https://blog.csdn.net/qq_42176520/article/details/82791788