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This article introduces the knowledge of "does the php string have a subscript?". In the operation of actual cases, many people will encounter such a dilemma. Then 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!

The php string has a subscript. In PHP, subscripts can be applied not only to arrays and objects, but also to strings. Using the subscript and brackets "[]" of the string, you can access the characters at the specified index position and read and write the characters. The syntax "string name [subscript value]"; the subscript value of a string can only be an integer type, with a starting value of 0.

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

The php string has a subscript.

In PHP, subscripts can be applied not only to arrays and objects, but also to strings.

In PHP, the character at the specified index position can be accessed and read and written using the subscript of the string and the bracket "[]". To the left of the brackets is the array name, and inside the brackets is the string subscript:

String name [subscript value]

Where the subscript (index value) can only be of an integer type with a starting value of 0 (the string subscript is counted from 0).

Example 1: output characters at a specified location

Example 2: modify the characters at the specified location

Note: this method is suitable for English characters. Chinese characters occupy more than one character length and can not be accurately located by using subscript.

Because the length of a man is 3 characters in utf-8 coding, when one character is replaced, the display will be garbled.

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