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Changing case

The following PHP functions return a copy of the subject string with changes in the case of the characters:

string strtolower(string subject)
string strtoupper(string subject)
string ucfirst(string subject)
string ucwords(string subject)

The following fragment shows how each operates:

print strtolower("PHP and MySQL"); // php and mysql
print strtoupper("PHP and MySQL"); // PHP AND MYSQL
print ucfirst("now is the time");  // Now is the time
print ucwords("now is the time");  // Now Is The Time

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