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php method to modify the key value of an array: first use range to generate an array of a specified range; then use [array_combine] to combine the keys and values to form a new array, the code is [$keys = range(2, 4 );$arr = array_combine($keys)].
php method to modify the key value of the array:
There is a method that does not use a loop, the code is as follows
<?php $arr = array(1=>'one',2=>'two',3=>'three'); $keys = range(2, 4); $arr = array_combine($keys, array_values($arr));
Among them, range
generates an array within the specified range, array_combine
combines keys and values to form a new array.
In actual application, please use it in combination with the original array length.
Please do this when using loops
<?php $arr = array(1=>'one',2=>'two',3=>'three'); for ($i = count($arr)+1; $i > 1; --$i) { $arr[$i] = $arr[$i-1]; } unset($arr[$i]);
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