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Today, I would like to share with you the relevant knowledge of what the function of php appends array elements is. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Four additional functions: 1, array_push (), syntax "array_push (array, element value list...)"; 2, array_merge (), syntax "array_merge (array 1, array 2...)"; 3, array_merge_recursive (), etc.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

To append an array element is to add an element at the end of the array. PHP has built-in functions to append array elements, which are described below.

1. Array_push () function

The array_push () function can insert one or more elements (key values) at the end of the array, with the following syntax:

Array_push ($array,$value1,$value2...)

Example:

2. Array_merge () function

The array_merge () function is used to merge one or more arrays into one array.

Array_merge (array1,array2,array3...)

Will array2,array3... Is stored in array1

Note: when a key in an input array already exists in the result array, array_merge () overwrites the previous key / value pair and replaces it with the key / value pair in the current input array.

Example:

3. Array_merge_recursive () function

The array_merge_recursive () function is the same as array_merge () above, and can combine two or more numbers together to form a joined array.

The difference is that when the same key name exists, array_merge () will overwrite the previous key / value pair, while array_merge_recursive () will merge the two values together to form a new array with the original key as the array name, and an array merge form, which is a recursive appended array.

Syntax:

Array_merge_recursive (array array1,array array2 [… , array arrayN])

Example:

4. Array_splice () function

The array_splice () function is a powerful function that can be used to delete, replace, or insert array elements (just set the parameter $length to 0). Syntax:

Array_splice ($array,$start,$length,$value)

When $length=0, the parameter $start specifies where to start the insertion (subscript)

The parameter $value specifies the insertion value (if it is multiple values, it needs to be set to an array).

When you set the value of $start to Array length value, that is, count ($arr), you can insert elements at the end of the array.

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