It's 1 floors today ... Write 1 First: (Numbers added)
Copy Code code as follows:
<?php
$a = "10"; "Connect" to the left of the right
$a + + "2"; Add the right to the left.
echo $a. " <br>\n "; The result here is 12, probably means, $a equals 10, then adds 2 to the left (that's $a), so it's 12.
?>
I think PHP is very focused on the concept of line, no matter what $a represents, probably mean to the right to the left. Connect to "or" add to "or" subtract "and so on,! Not just the Gallian between numbers. There are other ways.
Write 1 more: (right to left content)
Copy Code code as follows:
<?php
$b = "Bad Wolf";
$b. = "Good man!";
$b. = "Good man!";
echo $b. " Hehe!\n "; Show Final content!
?>
Why did the result show? If you listen carefully every time, the previous paragraph will say: The program is run from top to bottom, from right to left principle.
Write 1 more: (Division)
Copy Code code as follows:
<?php
$a = "65896255618562314793123219"; Here the complexity of the calculation, the original PHP processing here simple!
$a/= "465342233234234"; Multiply these 2 numbers!
echo $a. " ← This is the result!65896255618562314793123219 divided by 465342233234234, wow average people do not I fast! hehe @!\n "
?>
Get the result 141608156132, calculate the speed is really fast, hehe ...
Proceed to the next 1 major steps:
1. Bitwise operations (this is rarely used)
& Representative and (and)
| Representative or (or)
^ Representing mutexes (Xor)
<< want to shift left
>> Shift Right
~ Take 1 of the auxiliary number
2. Logical operation (condition, etc.)
< represents less than
> represents greater Than
<= less than or equal to
>= is greater than or equal to
= = Equals (General check for example user login equals not equal to condition)
!= is not equal to
&& and (and)
|| or or (or)
XOR Mutex (XOR)
! No (not)
Other symbols
3. Other operations
$ variables (used many times)
Index of & variables (plus before variables)
@ Do not display error message (added to function)
Example
Copy Code code as follows:
<?php
@include ("Dbx.txt"); If the dbx.txt does not exist, it will report an error, but the @ will not show!
echo "<br>\n";
?>
-> methods or properties of an object
element values for the => array
?: three far operator
Remember on the top can be, (but remember also not so easy, hehe!)
Below the introduction of more high-level, but also write procedures more commonly used key!
1. if (judgment) of a single line
If...else ...
If... What, what? How it turned out ... Responsible for... How...
If... You're fat ... You're a piggy. Otherwise... You're a skinny monkey.
if (Conditon) {Statment1} true True
else {Statment2} false false
Example:
<?php
$a = 4.998;
if ($a > 5)//No need to add a semicolon here, attention!
{
echo "to the!a > 5\n";
}
else//here does not need to add a semicolon, note!
{
echo "Wrong!a < 5\n";
}
?>
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