<?php //使用require()、include()函数 echo 'This is the main file.<br/>'; require('reusable.php'); echo 'The script will end now.<br>'; //函数声明 function my_function(){ echo 'My function was called'; } my_function(); //使用参数 function create_table($data){ echo "
".$value." |
"; } $var="contents 1"; fn(); echo "outside the function,\$var =".$var."
"; //参数的引用传递和值传递:地址符& function increment(&$value,$amount=1){ $value=$value+$amount; } $a=10; echo $a.'
'; increment($a); echo $a.'
'; //return关键字:终止函数的执行 function larger($x,$y){ if((!isset($x))||(!isset($y))){ echo "This function requires two numbers.
"; return; } if($x>=$y){ echo $x."
"; }else{ echo $y."
"; } } $a=1; $b=2.5; $c=1.9; larger($a,$b); larger($d,$a); //return关键字:从函数返回一个值 function smaller($x,$y){ if((!isset($x))||(!isset($y))){ return false; }else if($x'; echo smaller($d,$a).'
'; //实现递归 function reverse_r($str){ if(strlen($str)>0){ reverse_r(substr($str,1)); } echo substr($str,0,1); return; } function reverse_i($str){ for($i=1;$i'; reverse_i('hello'); //phpinfo();
更多细节参考php手册—函数
版权声明:本文为博主原创文章,未经博主允许不得转载。
以上就介绍了php的代码重用与函数,包括了方面的内容,希望对PHP教程有兴趣的朋友有所帮助。

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