PHP Fifth course automatic type conversion and Process Control _php tutorial

PHP class fifth automatic type conversion and Process Control

Study Summary:

1. Understand what automatic type conversions are

2. Understanding Basic Process Control Statements

3. Example: Implementing a Calendar Table

Automatic type conversion

1) integer-to-string

echo $num. " ABC ";

2) string-to-integer
$str +3;
3) Turn Boolean type
False case 0 "" "0" false array () NULL undefined


4) Forced type conversion

(int) $str (float) $str (string) $str

5) Constants

Define ("HOST", "localhost");

6) operator
① One Dollar
++ --


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


③ Sanyuan
? :


Process Control:
1. Process Control
2. Functions




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. Abort the loop
Break: Direct End

 
  ";}}? >//1 2

Continue: End of this cycle

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

Tip: Exit means pause the following program

Echo Date ("W");d ate in W for day of the week
 
  

Five. Remaining parts
1.do...while

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

4.99 Multiplication Table

 
  ";    }? >

3.PHP Implementation Calendar Table

Calendar table:
1. Two-layer for loop
2. Interlaced color change
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 a 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";? >

http://www.bkjia.com/PHPjc/871184.html www.bkjia.com true http://www.bkjia.com/PHPjc/871184.html techarticle PHP Fifth automatic type conversion and Process Control Learning Summary: 1. Learn about the 2 of automatic type conversions. Understanding basic Process Control Statements 3. Example: Implement automatic type of calendar table ...

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