Abandoned fish--how long does PHP take to get from getting started to giving up? 7

Today's Lesson: PHP 3-Day Foundation Consolidation video Tutorial "Yan 18"

1, 99 multiplication table

for ($i =1; $i <= 9; $i + +) {//Output 1-9echo $i, ' <br/> ';} or ($i =1; $i <= 9; $i + +) {//Output 1-9echo $i, '----'; for ($j =1; $j < $i; $j + +) {//Judgment output echo $j, ' &nbsp; ';} echo ' <br/> ';} for ($i =1; $i <= 9; $i + +) {for ($j =1; $j <= $i; $j + +) {echo $j, ' * ', $i, ' = ', $j * $i, ' &nbsp;&nbsp;&nbsp; '; /output}echo ' <br/> ';}

2, hundred money to buy hundred chickens

*/* Our ancient mathematician Zhang Chujian in the Book of "Zhang Chujian", put forward "hundred chicken Problem": Chicken Weng One, worth five, chicken mother one, worth three, chickens three, valuable one. Hundred money buys hundred chicken, asks the chicken Weng, the chicken mother, chickens each geometry? */for  ($g =1;  $g  <= 100 ;  $g + +)  { for  ($m =1;  $m  <=  100 ;  $m + +)  { for  ($x =1;  $x  <= 100 ;  $x + +)  {  if  ($g  +  $m  +  $x  == 100)  &&  ($g  * 5  +  $m  * 3 +  $x/3)  == 100  {echo  ' male   female   small ', $g, ' &nbsp; ', $m, ' &nbsp; ', $x, ' &nbsp; ', ' only <br /> ';}}} echo  ' <br /> ';for  ($g =1;  $g  <= 20 ;  $g +)  {//optimized   for  ($m =1;  $m  <= 33 ;  $m + +)  {  $x  = 100 -  $g  -  $m;if  (($g  +  $m  +  $x  == 100)  &&  ($g  *  5 +  $m  * 3 +  $x/3)  == 100  {echo  ' male   female &nbsp, small each ', $g, ' &nbsp; ', $m, ' &nbsp; ', $x, ' &nbsp; ', ' only <br /> ';}}} 

3. Functions

A function is a well-encapsulated code that can be called at any time, function t () {echo "Hello"; echo "World"; echo "!<br/>";} T (); t (); Echo ' <br/> '; function h ($a, $b) {$c = $a + $b; $d = $a * $b; Echo $c, ' <br/> '; echo $d;} H (+); Echo ' <br/> '; function h2 ($a, $b) {//return value $c = $a + $b; return $c;} $d = h2 (4,5); Echo $d;

4. Function definition Format

/*function function name ([parameter] [parameter]) {//EXECUTE statement//return;} naming rules: For functions, naming rules and variables, but functions are not case-sensitive */

5. Function execution and return process

echo ' <br/> '; function A () {//All statements are executed or a return statement is encountered, and functions return echo "AAAAA <br/>";} echo "B<br/>"; a (); echo "string"; Echo ' <br/> '; function B () {echo "1"; echo "2"; return ' 3 '; echo "4"; echo "5"; re Turn ' 6 ';} $a = B (); Echo $a; echo "b<br/>"; function C () {return 1,4;//return can return no value, or only one value}

6. Function Transfer method

echo "<br/>"; function d ($a) {$a + = 1;} $b = 3;d ($b),//$b, equivalent to the value of descending $b is assigned to $ A. And a $ A is the function inside the value, how to change is not related to the outside Echo $b, ' <br/> '; function d2 (& $a) {$a + = 1;} $b = 5;d2 ($b); echo $b;//$a and $b point to the same address, which is not recommended because the inner statement of the function affects external variables and destroys the encapsulation of the function.

7. Function scope

echo "<br/>"; function e () {//In the PHP page, the declared variable is called a global variable, and the function declares a local variable called the Echo $a;} E (); echo "<br/>";//DECLARE global variable globalfunction f () {global $a; echo $a;} f (); echo "<br/>";//Super global variable, in any part of the page, including functions, methods, etc., can directly access function g () {Print_r ($_get);} g (); echo "<br/>";

Sleep, another #我要上首页 # m M I want the first page, is this the way to play??

This article from "A Big big waste fish" blog, declined reprint!

Abandoned fish--how long does PHP take to get from getting started to giving up? 7