Automatic type conversion and flow control in the fifth lesson of PHP

Study Summary:

1. Understand what automatic type conversions are

2. Understand the basic Process Control statements

3. Example: the implementation of the calendar form

Automatic type conversion

1) Integer Turn string

echo $num. " ABC ";

2) String Rounding type
$str +3;
3) Boolean type
False case 0 "" 0 "false array () NULL undefined


4) Force type conversion

(int) $str
(float) $str
(String) $str

5) constant

Define ("HOST", "localhost");

6) operator
① a Dollar
++ --


② two Yuan
= - * / %
= += -= *= /= %=
> >= < <= = =!= = =!==
&&!


③ Ternary
? :


Process Control:
1. Process Control
2. function




Process Control:


I. Branching structure
If...elseif....else
Switch...case
If the condition is a fixed value, use the switch statement


Two. Cycle control
For
While


Three. Discontinue circulation
Break: Direct End

 
  ";
		}
	}
		
	? >//1 2

Continue: End this cycle

 
  ";
		}
	}
		
	? >//1 2 4 5 6 7 8 9

Tip: Exit says pause the following program

Echo Date ("W");
Date in W indicates day of the week

 
  

Five. The remaining part
1.do...while

				
 
  {$score} ";
			} while ($score >=60);
		? >

4.99 Multiplication Table

 
  ";
		    }
	? >

3.PHP Implementation Calendar Table

Calendar table:
1. Two-layer for loop
2. Alternate color of interlaced
3. Use the IF condition to judge
4.header Head Change Code

 
  ";
	for ($i =1; $i <= $days;) {
		echo "";
		For ($j =0 $j <7; $j + +) {
			if ($i > $days) {
				echo "";
			} else{
			echo "{$i}";
			}
				$i + +;
		}
		echo "";
		
	}
	
	echo "";
? >

Add background color

 
  ";
	For ($i =1 $i <= $days;) {
		
		$k + +;
		
		if ($k%2==1) {
			echo "";
		} else{
			echo "";
		}
		
		For ($j =0 $j <7; $j + +) {
			if ($i > $days) {
				echo "";
			} else{
			echo "{$i}";
			}
				$i + +;
		}
		echo "";
		
	}
	
	echo "";
? >
	Abort Script
	
		2.exit (); Abort script using
	    3.die ();
			    
 
   ";
		 Die ("Start script abort from here");
		 echo "2222222";
		? >