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php数组如何保留数字索引

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Release： 2016-06-13 13:18:08
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php数组怎么保留数字索引？
php数组怎么保留数字索引？

PHP code
<!--

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-->
<?php $arr=array("4","5","6");

    $arr2=array();
    foreach($arr as $v){
        $arr2[$v]=$v;
    }
    print_r($arr2);
    echo "<hr>";
    $arr3=array_merge(array("1"=>"1","2"=>"..."),$arr2);
    print_r($arr3);
?>
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------解决方案--------------------
print_r(array("1"=>"1","2"=>"...") + $arr2);

Array ( [1] => 1 [2] => ... [4] => 4 [5] => 5 [6] => 6 ) 


array_merge() 将一个或多个数组的单元合并起来，一个数组中的值附加在前一个数组的后面。返回作为结果的数组。 

如果输入的数组中有相同的字符串键名，则该键名后面的值将覆盖前一个值。然而，如果数组包含数字键名，后面的值将不会覆盖原来的值，而是附加到后面。 

如果只给了一个数组并且该数组是数字索引的，则键名会以连续方式重新索引。
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