There are several differences in php array merging

There are three differences between array merging in PHP, namely: 1. When both arrays use numbers as indexes, the merged array will add values ​​to the new array in order; 2. When When one array uses strings as indexes and the other array uses associative indexes, the merged array will add the key-value pairs in both arrays to the new array; 3. Use the array merge operator " " to directly merge the two arrays. arrays into a new array.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

In PHP, there are three differences between array merging, they are:

1. Merging of numeric index arrays: When both arrays are used When numbers are used as indexes, the merged array adds values ​​to the new array in order. If two arrays have the same index, the value of the later array will overwrite the value of the previous array.

2. Merge of associative index arrays: When one array uses strings as indexes and another array uses associative indexes, the merged array will contain all key-value pairs in both arrays. When added to a new array, if it has the same index, the value of the subsequent array will overwrite the value of the previous array.

3. Array merge operator ( ): Use the array merge operator to directly merge two arrays into a new array. If there are the same indexes, the values ​​of the previous array will be retained, and the values ​​of the subsequent array will be ignored.

These are the commonly used array merging methods in PHP. You can choose the appropriate method for array merging according to different needs.

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