How to convert uppercase to lowercase in php

php method to convert uppercase to lowercase: first create a PHP sample file; then enter the conversion content as "$str = strtolower($str);"; finally use echo to output the converted result.

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Convert the string to lowercase

strtolower(): This function converts all the characters of the incoming string parameter into lowercase and puts the string back in small definite form.

Example:

Output result:

i want to fly

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