PHP合并数组+号和array_merge的区别
这篇文章主要介绍了PHP合并数组+号和array_merge的区别,PHP的数组融合一般有两种做法,一种是直接使用加号相加,另一种则是使用array_merge函数进行相加,两者之间有点区别,需要的朋友可以参考下
PHP的数组融合一般有两种做法，一种是直接使用加号相加，另一种则是使用array_merge函数进行相加，两者之间有点区别：
1.相加会证数组中的自然index不被重置
2.相加方法中，被加的数组内的值不会被覆盖
3.merge函数中的自然index会被重置
4.merge函数，无所谓被merge和merge关系，越后面的array参数，其值，会覆盖较前面的array参数相同键的值
例子：
数组1：
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$arr1 = array( 10 => 'valueof10', 11 => 'valueof11', 'key1' => 'dataofkey1', 'key2' => 'dataofkey2', 'array' => array( 'key1' => 1, 'key2' => 'abc', 'key3' => array( 1, 2, 'name' => 'peter' ), ), ); |
数组2：
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$arr2 = array( 10 => 'newvalueof10', 11 => 'newvalueof11', 'key1' => 'newdataofkey1', 'key3' => 'newdataofkey3', 'array' => array( 'key1' => 2, 'key2' => 'defg', 'key3' => array( 1, 2, 'name' => 'jonathan', 'gender' => 'male' ), ), ); |
结果比较：
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array (size=6) 10 => string 'valueof10' (length=9) 11 => string 'valueof11' (length=9) 'key1' => string 'dataofkey1' (length=10) 'key2' => string 'dataofkey2' (length=10) 'array' => array (size=3) 'key1' => int 1 'key2' => string 'abc' (length=3) 'key3' => array (size=3) 0 => int 1 1 => int 2 'name' => string 'peter' (length=5) 'key3' => string 'newdataofkey3' (length=13)
array (size=8) 0 => string 'valueof10' (length=9) 1 => string 'valueof11' (length=9) 'key1' => string 'newdataofkey1' (length=13) 'key2' => string 'dataofkey2' (length=10) 'array' => array (size=3) 'key1' => int 2 'key2' => string 'defg' (length=4) 'key3' => array (size=4) 0 => int 1 1 => int 2 'name' => string 'jonathan' (length=8) 'gender' => string 'male' (length=4) 2 => string 'newvalueof10' (length=12) 3 => string 'newvalueof11' (length=12) 'key3' => string 'newdataofkey3' (length=13) |
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