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This article introduces the knowledge of "how to replace the elements in the array by PHP". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Replacement method: 1, with "array_replace (array, replace array)", you can replace the elements of the first array with the elements of the following array. 2. Use "array_splice (array, start position, number, replacement value)" to replace the specified number of elements from the specified position. If multiple values are replaced, the replacement value can be an array.

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

There are two ways for PHP to replace elements in an array:

1. Using the array_replace () function

The array_replace () function replaces the value of the first array with the value of the following array.

Array_replace (array, replacement array)

Note: there can be more than one replacement array, separated between them.

If you specify more than one array to replace, the values of the subsequent array will overwrite the values of the previous array.

2. Using the array_splice () function

Array_splice () is a powerful function that removes, inserts, and replaces elements.

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

Parameters:

Arr represents an array.

Start indicates where to start the deletion (subscript):

If start is positive, it is deleted from after going.

If the start is negative, it is deleted from back to front, starting from the end of the arr-start. For example,-2 means starting with the penultimate element of the array.

Length is an optional parameter that indicates the number of elements deleted:

If length is positive, it means deleting length elements

If length is negative, all elements from start to the reciprocal length at the end of the array will be deleted

If omitted, all elements from start to the end of the array are deleted.

Replacement is an optional parameter that represents the value to replace. If replacement has more than one value, it needs to be set to an array, and if there is only one value, it can not be set to an array.

If you are performing a replacement operation, the duration value and the number of replacement need to be the same.

Note that replacing array elements with replacement does not retain the original key name.

That's all for "how PHP replaces elements in an array". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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