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php中合并数组:array_merge与array+array的区别分析 - 站长搜索
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php中合并数组:array_merge与array+array的区别分析

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2014-12-16 01:39:05 转载来源: 网络整理/侵权必删

本文为大家讲解的是php中合并数组:array_merge与array+array的区别分析,感兴趣的同学参考下. 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:$a = array('d'=>'aass','e'=>'adsdfd','asd'=>'asdsdd','ddfg'=>'dssdf'); $b = array('d'=>'adddd','adsdfd','asdfsddddd','d'

本文为大家讲解的是php合并数组:array_mergearray+array区别分析,感兴趣的同学参考下.


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:$a = array('d'=>'aass','e'=>'adsdfd','asd'=>'asdsdd','ddfg'=>'dssdf');


$b = array('d'=>'adddd','adsdfd','asdfsddddd','d'=>'aass');
$d = $a + $b;
$e = array_merge($a,$b);
var_dump($d);
var_dump($e);


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


标签: php 合并 数组 array merge array+array 区别 分析


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