How to convert string to lowercase in php

php method to convert a string to lowercase: 1. strtolower() function, which can convert all letters in the string to lowercase, the syntax is "strtolower (string)"; 2. lcfirst() function , you can convert the first character in the string to lowercase, the syntax is "lcfirst(string)".

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

php can change characters Convert string to lowercase

Method 1: Use strtolower() function

strtolower() function to convert string to lowercase.

Syntax:

strtolower(string)

Example:

Output:

hello world!

Method 2: Use lcfirst() function

lcfirst() function converts the first character in a string to lowercase.

Grammar:

lcfirst(string)

Example:

Output:

hELLO WORLD!

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