How does php modify the subscript of an array
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Two methods: 1. Using the "array_values ($arr)" statement, you can convert an associative array into an indexed array and a string subscript into a pure numeric subscript. 2, use "array_combine (key name array, original array)" statement, the elements of one array as the subscript of another array, the number of elements of the two arrays should be the same.
Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer
Two methods of modifying Array subscript by php
1. Use the array_values () function
The array_values () function converts an associative array into an indexed array and converts a string subscript to a pure numeric subscript.
2. Use the array_combine () function
The array_combine () function can take the elements of one array as the key name (subscript) of another array.
Example 1: convert an indexed array to an associative array
Example 2: modify the subscript of an associative array
Description:
The array_combine ($keys,$values) function creates a new array by merging two arrays, where the element in the $keys array is the key name of the new array, and the element of the $values array is the key value of the new array.
It is important to note, however, that when creating an array using the array_combine () function, the number of elements in the $keys array and the $values array must be the same, so that the key name and key value correspond one to one, otherwise an error will be reported and FALSE will be returned.
And the $keys array cannot be a multi-dimensional array, otherwise an error will be reported, but the $values array can be a multi-dimensional array.
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