php 基础笔记

snake_l

　　/***************************bygarcon1986********************************/
　　<?php//example1$makefoo = true;bar();if($makefoo){function foo(){echo "doesn't exist.<br>";}}if($makefoo)foo();function bar(){echo "exist<br>";}//example2function sjg(){function wl(){echo 'must call sjg() before wl()!<br>';}}sjg();wl();//wl();//sjg();//example3 - 递归$a = 10;function recursion($a){if($a <= 20){echo "$a/n";recursion($a+1);}}recursion($a);echo "<br>";//example4 - 向函数传递数组$input1=array('hi','ni','hao','ya');function record($input1){echo $input1[0],$input1[1],$input1[2];}record($input1);//pass the function's parameter by referencefunction add_some_extra(&$string){$string .= 'wl wo ai ni.';}$str1 = 'wo xiang shuo,';add_some_extra($str1);echo $str1.'<br>';  //output: wo xiang shuo, wl wo ai ni.//default parameter 默认参数function makecoffee($category = "cappuccino"){//return "makeing a cup of $category./n";echo "making a cup of $category";}echo makecoffee().'<br>';echo makecoffee("espresso").'<br>';// add one more parameterfunction makeyogurt($type = "acidophilus", $flavour){return "making a bowl of $type and $flavour/n".'<br>';//return "Makin a bowl of $flavour/n";}echo makeyogurt("","raspberry");   // won't work as expected//echo makeyogurt();function makeyogurt2($flavour,$type = "acidophilus"){//return "making a bowl of $type and $flavour/n".'<br>';return "Makin a bowl of $flavour $type/n";}echo makeyogurt2("raspberry").'<br>';   // will work as expected//return 示例function square($num){return $num * $num;}echo square(4).'<p>';function small_numbers(){return array(0,1,2);}list($zero,$one,$two) = small_numbers();echo $zero,$one,$two.'<p>';function &returns_reference(){return $someref;}$newref = & returns_reference();echo $newref;//变量函数function foo2(){echo "in foo2() <br>/n";}function bar2($args=''){echo "in bar2(); argument was '$args'.<br />/n";}function echoit($string){echo $string.'<br>';}function lm(){echo "wxryy.<br>";}$func = 'foo2';$func();$func = 'bar2';$func('test');$func = 'echoit';$func('test');$funct = 'lm';$funct('wl');// variable methodclass Foo{function Variable(){$name = 'Bar3';$this->$name(); // this calls to Bar3}function Bar3(){echo "This is Bar3";}}$foo = new Foo();$functname = "Variable";$foo->$functname(); // this calls $foo->Variable()?>