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This article mainly introduces the relevant knowledge of "how to increase key-value pairs in php array". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how to increase key-value pairs in php array" can help you solve the problem.

Php array to add key-value pairs: 1, use the "array_pad ($arr,$size,$value)" statement; 2, use the "array_unshift ($arr,$value)" statement; 3, use the "array_push ($arr,$value)" statement.

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

Add key-value pairs to php array

1. Use the array_pad () function

The array_pad () function can fill an array to a specified length with a value, and its syntax is as follows:

Array_pad ($arr, $size, $value)

Parameter description:

Arr represents the array to be populated.

Size indicates the length to which to fill:

If size is positive, fill it to the right side of the array

If size is negative, fill it from the left

If the absolute value of size is less than or equal to the length of the arr array, there is no padding.

Value represents the value to be populated.

Example:

2. Use the array_unshift () function

The array_unshift () function is used to insert one or more elements at the beginning of an array. The syntax is as follows:

Array_unshift (array & $arr, mixed $value1 [, mixed $value2, mixed $value3...])

There are two points:

Elements are inserted as a whole, and they remain in the same order after insertion.

All numeric key names will be changed to recount from 0, and all string key names will remain the same.

Example:

3. Use the array_push () function

The array_push () function is used to insert one or more elements (on the stack) at the end of the array. The syntax is as follows:

Array_push (array & $arr, mixed $value1 [, mixed $value2, mixed $value3...])

Example:

This is the end of the introduction to "how to add key-value pairs to php arrays". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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