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This article is about how to convert lowercase to uppercase in php strings. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Php string lowercase to uppercase method: 1, use strtoupper () function, syntax "strtoupper ($string)"; 2, use mb_strtoupper () function, syntax "mb_strtoupper ($string,$encoding)".

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

Php string converts lowercase to uppercase

Method 1: use the strtoupper () function

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.

The sample code is as follows:

The running results are as follows:

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Method 2: use the mb_strtoupper () function

The function of the mb_strtoupper () function is similar to that of the strtoupper () function, which can also convert letters in a string to uppercase, and the mb_strtoupper () function can also set the character encoding of the parameter. The syntax format is as follows:

Mb_strtoupper ($string [, $encoding = mb_internal_encoding ()])

Where $string is the string to be converted and $encoding is an optional parameter that sets the character encoding of the parameter.

Unlike the strtoupper () function, the letters in $string are determined by the Unicode character attribute. So the mb_strtoupper () function is not affected by the locale (locale) setting and can convert any character with a "letter" attribute, such as a consonant (ä).

The sample code is as follows:

The running results are as follows:

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