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Editor to share with you how to define the use of array_merge, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

Array_merge () is a function in the PHP language that combines the cells of two or more arrays, the value of the same string key overrides the previous value, and the values corresponding to the numeric index are reordered and the results are returned.

Array_merge () definition

Array_merge () merges the cells of one or more arrays, with values in one array appended to the previous array. Returns an array as a result.

Arrayarray_merge (array$array1 [, array$array2 [, array$...]])

Usage of array_merge ()

1) if the input array has the same string key name, the key value of the key is the value corresponding to the last key name (the latter value overrides the previous same value). If the array is a numeric key name, the key name will be re-indexed in a continuous manner, that is, the subsequent value will not overwrite the original value, but will be appended to it.

2) if only an array is entered into the array_merge () function, and the key name is an integer, the function returns a new array with the integer key name, whose key name starts with 0 for re-indexing. (see example 2)

3): when the key name of the following array element is the same as that of the previous array element, the key value of the corresponding key name in the resulting array is overwritten by the latter, that is, the latter key value. (see example 3)

Grammar.

Array_merge (array1 [, array2 [, array3...]])

Parameters.

Description

Array1

Necessary. The first array entered.

Array2

Optional. The second array entered.

Array3

Optional. Multiple input arrays that can be specified.

Example 1

Output:

Array ([a] = > Horse [b] = > Cat [c] = > Cow)

Example 2

Use only one array parameter:

Output:

Array ([0] = > Horse [1] = > Dog)

Example 3

Output:

Array ([a] = > Cow [b] = > Cat)

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