How to use PHP based operators _php instance

1, arithmetic operators: + 、-、 *,/,%.

2, Increment/decrement operators: such as $a++, $a--, + + $a,--$a.

Such as:

<?php
$a = 10;
$b = 5;
$c = $a + +; //First assign value, then increase. $c = $a, $a = $a +1
$d = $b--; ///First assign value, then subtract from. $d = $b, $b = $a-1
echo ' $a = '. $a. ' | | ' $c = '. $c. ' <br/> '; $a =11, $c =10
echo ' $b = '. $b. ' | | ' $d = '. $d. ' <br/> '; $b =4, $d =5
?>

<?php
$a = 10;
$b = 5;
$c =++ $a; ///increase first, then assign value. $a = $a +1, $c = $a
$d =--$b; ///Subtract first, then assign value. $b = $a-1, $d = $b
echo ' $a = '. $a. ' | | ' $c = '. $c. ' <br/> '; $a =11, $c =11
echo ' $b = '. $b. ' | | ' $d = '. $d. ' <br/> '; $b =4, $d =4
?>

3. Comparison operator: Reference document

4. Logical operators:

Such as:

$a =10; $b = 7;
if ($a ++>8 | | | $b ++>7) { //$a ++>8 is true, $b ++>7 This will not be executed.
Echo ' ok! ';
}
Echo ' a= '. $a. ' b= '. $b; //Output ok,a=11,b=7

Change

$a =10; $b = 7;
if ($a ++>10 && $b ++>7) {//$a ++>8 is false, $b ++>7 This will not be executed.
Echo ' ok! ';
}
Echo ' a= '. $a. ' b= '. $b; //A=11,b=7

Details:and && both represent logic and, where are their differences?

Mainly in the priority level above

and priority

and< = <&&

or < = < | |

such as:

$a =false | | true;//&& > = > and; Compare False First | | True, and then assign a value
$b =false or true;//| | > = > or   to assign a value $b=false first, and then compare, so the result is false
Var_dump ($a, $b);// BOOL (TRUE) bool (false)