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:
1、
<?php
$beginning = 'foo';
$end = array(1 = 'bar');
$result = array_merge((array)$beginning, (array)$end);
print_r($result);
?
以上例程会输出:
Array ( [0] = foo [1] = bar )
2、
<?php
$array1 = array("color" = "red", 2, 4);
$array2 = array("a", "b", "color" = "green", "shape" = "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?
以上例程会输出:
Array ( [color] = green [0] = 2 [1] = 4 [2] = a [3] = b [shape] = trapezoid [4] = 4 )
3、
<?php
$array1 = array();
$array2 = array(1 = "data");
$result = array_merge($array1, $array2);
?
别忘了数字键名将会被重新编号!
Array ( [0] = data )
4、
<?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);
?
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:
<?php
$array1 = array("a" = "green", "red", "blue", "red");
$array2 = array("b" = "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result);
?
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
<?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);
?
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。)
<?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));
?
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,
参数:array::输入的数组, offset:序列偏移量, length:单元长度
$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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