PHP basic syntax examples

demo1:

//Use two ways to output hello world and line break
echo "hello word".'
';
print "hello word2".'
';
//Define variable assignment, and add it again and output
$a=1234;
echo $a.'
';
echo + +$a.'
';

?>

demo2:

//Customize variable case and underline
//Define Boolean variables and output
$bo=true;
echo $bo.'
';
//Define integer variable and output
$bo=12;
echo $bo. '
';
//Define floating point variables and output
$bo=1.001;
echo $bo.'
';
// Define string variables and output them. Double quotes support escape characters, and single quotes support simple single quote escape.
$bo="oren word";
echo $bo.'
';
//Two ways to define arrays
$bo=array(1,2, 3,4);
//$bo=arrar("A"=>1,"B"=>2);
echo $bo[1];

?>

demo3:

//Introduction and application of PHP operation types.
//1. Arithmetic operation
echo 4+5*5/9;
//2. Assignment operation
$a=1;
echo $a.'
';
$a+=2;
echo $a.'
';
$a*=3;
echo $a.'
//3. Comparison operation, get Boolean value, true will output 1, false will output nothing.
//echo 1==2;
//echo 3!=2;
//echo 5<3;
//echo "ok"=="ok";
//The double equals sign only judges the numerical value; the triple equals sign will judge the type first, both the numerical value and the type.
echo (1=='1').'
';
//echo 1===='1';
//4. Logical operations.
echo (1&&1).'
';
echo (0&&1).'
';
echo (1||1).'
';
echo (0||1).'
';
//5. Increment and decrement operation
$b=1;
echo $b++." ";
echo ++$b."
?>
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