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Case conversion method: 1, with strtolower (), the character can be converted to lowercase; 2, with strtoupper (), the character can be converted to uppercase; 3, with ucfirst (), the first letter of the string can be converted to uppercase; 4, with ucwords (), the first letter of each word in the string can be converted to uppercase.

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

The function of case conversion by php

1. Strtolower () function-converts characters to lowercase

The strtolower () function converts letters in a string to lowercase in the following syntax format:

Strtolower ($string)

Where $string is a parameter of type string, and this function converts the letters in the parameter $string to lowercase and returns the converted string.

2. Use the strtoupper function to convert characters to uppercase

The strtoupper () function converts letters in a string to uppercase, in the following syntax format:

Strtoupper ($string)

Where $string is a parameter of type string, and this function converts the letters in the parameter $string to uppercase and returns the converted string.

3. Use the ucfirst () function to convert the first letter to uppercase

The ucfirst function converts the first letter of a string to uppercase. The syntax format is as follows:

Ucfirst ($string)

Where $string is the string to be converted.

4. Use the ucwords () function to convert the first letter of each word to uppercase

The ucwords () function converts the first letter of each word in a string to uppercase, in the following syntax format:

Ucwords ($string [, $delimiters = "\ t\ r\ n\ f\ v"])

Where $string is the string to be converted, and $delimiters is an optional parameter to represent the word separator. The default is space character, tab character, line feed character, carriage return character, horizontal line, and vertical bar.

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