PHP Basic Syntax

<?php

/*
echo "Hello", "AAA"; Output statements that can output multiple strings
print "World"; Only one string can be output

*/

PHP is a weakly typed language

/* $a = 5; PHP defines variables, starting with $
echo $a; */

/* $a = "hell0";
$hello = "World";
echo $ $a;//mutable variable
*/

$a = 5;
echo isset ($a); Determines whether a variable is defined.

unset ($a); Clear variables

Empty ($a); Determine if the variable is empty

/* $a = 5;
$b =& $a;//Take Address
$b = 10;
echo $a;
*/

/* $a = 5;
Var_dump ($a);//Output variable details
$b = (string) $a;//Type conversion
*/

/* $a = 10;
$b = 3;
echo $a/$b; */

echo "Hello". " Word ";//splicing string with". "No +

echo @ $a;//error suppressor, can mask error

/*echo true? " Male ":" Female "; Trinocular operator
echo 5==5? " Male ":" Female ";
*/

?>

PHP Basic Syntax