<Ajax> I. PHP basic usage and basic data types

<?PHP//This is a single-line comment    /** * This is a lot of comments*/     //set the encoding format    Header(' Content-type:text/html;charset=utf-8 '); //Output content//String    $name= ' Raylee '; Echo $name; //Output line break    Echo' <br> '; //Basic data Types    $num= ' 123 '; Echo $num; //Output line break    Echo' <br> '; //decimal    $pi= ' 3.1415 '; Echo $pi; //Output line break    Echo' <br> '; //BOOL    $male=false; if($male==false) {        EchoSister; } Else {        EchoMan; }?>

<Ajax> I. PHP basic usage and basic data types