PHP中数组合并的步骤
PHP中数组合并的方法
1. array array_merge(array $array1[, array $...])
合并一个或多个数组的元素,将后面的元素追加到前面的元素后面,并返回结果数组。
Code:
$arr1 = array( 'astr1' => 'astr1', 3 => 'anum1');$arr2 = array( 1 => 'bnum1', 2 => 'bnum2', 'bstr1' => 'bstr1', 3 => 'bnum3', 'astr1' => 'bstr2', '0' => 'bstr3', '1' => 'bstr4');print_r(array_merge($arr1, $arr2));
Result:
Array( [astr1] => bstr2 [0] => anum1 [1] => bstr4 [2] => bnum2 [bstr1] => bstr1 [3] => bnum3 [4] => bstr3)
Conclusion:
key为数值的元素,从key=0开始按照递增的规则重新排序,如出现重复的key值时,依旧按递增的顺序排;
key为字符串的元素,按照原来的顺序排列,如出现重复的key时,后面的值会覆盖前面的值;
当key为‘0’时,按照数字处理;当key为'1',‘2’等其他数字字符串时,会覆盖前面key为1,2的值

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