php信息
PHP信息<p><?php
echo "当前PHP版本:".PHP_VERSION."<p>";
echo "当前操作系统:".PHP_OS."<p>";
echo "WEB服务器与PHP之间的端口:".PHP_SAPI."<p>";
echo "PHP默认的包含路径：".DEFAULT_INCLUDE_PATH."<p>";
echo "当前正在执行脚本的文件名：".$_SERVER['PHP_SELF']."<p>";
echo "服务器IP地址：".$_SERVER['SERVER_ADDR']."<p>";
echo "服务器名称：".$_SERVER['SERVER_NAME']."<p>";
echo "文档根目录：".$_SERVER['DOCUMENT_ROOT']."<p>";
echo "用户连接到服务器时所使用的端口:".$_SERVER['REMOTE_PORT']."<p>";
echo "服务器所使用的端口：".$_SERVER['SERVER_PORT']."<p>";
echo "当前脚本路径：".$_SERVER['SCRIPT_NAME']."<p>";
echo "执行脚本的绝对路径：".$_SERVER['PATH_TRANSLATED']."<p>";
echo "用户当前的IP地址:".$_SERVER['REMOTE_ADDR']."<p>";
echo "用户的主机名:".$_SERVER['REMOTE_HOST']."<P>";
?>
自定义常量<p></p>
<?php
define("city","北京");
echo city;
?>
<p></p>
自定义变量<p></p>
<?php
$var=100;
$var2="Hello";
echo $var;
?>
<br>
php5支持类型强制转换<br>
settype(mixed var,string type)
<?php
$ss = "23hh";
settype($ss,"integer");
echo $ss."<p>";
?>
九九运算表<br>
<?php
for ($i=1;$i<10;$i++){
for($j=1;$j<=$i;$j++){
echo $j."X".$i."=".$i*$j;
echo " ";
}
echo "<br>";
}
?>
数组<br>
<?php
$arr1 = array(11,"a"=>"hello world",16);
$arr1["b"]= "goby";
print_r($arr1);
echo $arr1+$arr1;
?>
<pre>
<?php
$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x','y','z'));
print_r ($a);
print_r ($a+$arr1);
?>
</pre>
三目运算符<br>
<?php
$a1 = 20;
$a2 = 30;
($a1>$a2)?($re="yes"):($re="no");//输出no
echo $re;
?>
错误控制运算符<br>
<?php
//$my_file = @file('不存在的文件') or die("打开文件文件错误");
?>
自定义函数<br>
<?php
function write(){
echo "访问了函数"."<br>";
}
function calculator($str){
$cal = 100+$str;
return $cal;
}
write();
echo calculator(10);
?>
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