解析php中array_merge与array+array的区别

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array_merge是丢弃原来的数字的key,而保留字符串形式的key,然后组成一个新的数组,不管键名是否一样,都不合并,除非键名和value同时一样并且还必须是字符串形式的key才合并。而array+array就是不管你是什么情况,它都只会先把前面的数组的数据先放到新生成的数组中,之后再看第二个array是否比第一个数组个数多,多的就添加进来,它只数个数,但是这种情况它会添加进来:<FONT style="COLOR: #ff0000">$a = array('d'=>'aass','e'=>'adsdfd','asd'=>'asdsdd','ddfg'=>'dssdf');@H_403_1@<div class="codetitle"><a style="CURSOR: pointer" data="86347" class="copybut" id="copybut86347" onclick="doCopy('code86347')"> 代码如下:

<div class="codebody" id="code86347">@H_4031@$b = array('d'=>'adddd','adsdfd','asdfsddddd','d'=>'aass');@H4031@$d = $a + $b;@H403_1@$e = arraymerge($a,$b);@H403_1@vardump($d);@H403_1@vardump($e);@H4031@
@H4031@打印:@H4031@

<FONT style="COLOR: #ff0000">array@H4031@

'd' => string 'aass' (length=4)@H4031@ 'e' => string 'adsdfd' (length=6)@H4031@ 'asd' => string 'asdsdd' (length=6)@H4031@ 'ddfg' => string 'dssdf' (length=5)@H4031@ 0 => string 'adsdfd' (length=6)@H4031@ 1 => string 'asdfsddddd' (length=10)@H4031@

<FONT style="COLOR: #ff0000">array@H4031@

'd' => string 'aass' (length=4)@H4031@ 'e' => string 'adsdfd' (length=6)@H4031@ 'asd' => string 'asdsdd' (length=6)@H4031@ 'ddfg' => string 'dssdf' (length=5)@H4031@ 0 => string 'adsdfd' (length=6)@H403_1@ 1 => string 'asdfsddddd' (length=10)

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