php ob_start(ob_gzhandler)进行网页压缩

<?php  

ob_start(); //打开缓冲区  
phpinfo(); //使用phpinfo函数  
$info=ob_get_contents(); //得到缓冲区的内容并且赋值给$info  
$file=fopen(’info.txt’,'w’); //打开文件info.txt  
fwrite($file,$info); //写入信息到info.txt  
fclose($file); //关闭文件info.txt  

?> 

//启用压缩   
if(function_exists('ob_gzip'))   
{   
   ob_start('ob_gzip');   
}   
//准备一些待压缩的内容   
for($i=0; $i<100; $i++)   
{   
    echo('这里是测试内容 <br>');   
}   
//输出压缩成果   
ob_end_flush();   
  
  
//这是ob_gzip压缩函数   
function ob_gzip ($content)   
{   
    if( !headers_sent()  && extension_loaded ("zlib")  && strstr ( $_SERVER["HTTP_ACCEPT_ENCODING"], "gzip")){   
        $content = gzencode($content,9);   
        header ("Content- Encoding: gzip");   
        header ("Vary: Accept- Encoding");   
        header ("Content- Length: ".strlen ($content));   
    }   
    return ($content) ;   
}

<?php
/* php foreach循环简单例子 */   
$a = array('a'=>'网上','b'=>'朋友','c'=>'其它',);   
// 这是一个hash数组,我们现在把内容输出   
foreach ($a as $key => $value) {   
    echo $key . '->' . $value . '<br>';   
}   
?>  
<?php
$a = array('a'=>'网上','b'=>'朋友','c'=>'其它',);

<?

1,"two"=>2,"three"=>3,"four"=>4);
foreach($array1 as $key=>$value)
{echo "KEY:$key value: $value n";}

$array2=array(5,6,7,8);
foreach($array2 as &$value)
{
$value=$value*2;
echo "$valuen";
}

?>

结果是

$array1=array("one"=>1,”two”=>2,”three”=>3,”four”=>4);
foreach($array1 as $key=>$value)
{echo “KEY:$key value: $value n”;}

$array2=array(5,6,7,8);
foreach($array2 as &$value)
{
$value=$value*2;
echo “$valuen”;
}

?>

foreach ($array as &$row) {
$row = explode(‘/’, $row);
}
unset($row);
foreach ($array as $row) {
//do something
}

或者第一个循环这么写

foreach ($array as $key => $row) {
$array[$key] = explode(‘/’, $row);
}

<?

// Start snipit 1

$sql = "SELECT * from <table>";
$result = mysql_query($sql);

while ($row = mysql_fetch_assoc($result)) {
         // do stuff with $row
}

mysql_data_seek($result, 0); //关键是这儿

while ($row = mysql_fetch_assoc($result)) {
         // do other stuff with $row
}
?>

文件存在(当前目录)
is_file:0.4570ms
file_exists:2.0640ms

文件存在(绝对路径3层/www/hx/a/)
is_file:0.4909ms
file_exists:3.3500ms

文件存在(绝对路径5层/www/hx/a/b/c/)
is_file:0.4961ms
file_exists:4.2100ms

文件不存在(当前目录)
is_file:2.0170ms
file_exists:1.9848ms

文件不存在(绝对路径5层/www/hx/a/b/c/)
is_file:4.1909ms
file_exists:4.1502ms

目录存在
file_exists:2.9271ms
is_dir:0.4601ms
目录不存在
file_exists:2.9719ms
is_dir:2.9359ms

<?php
$a =array(100,80,50,10,0);
$b = array("c","f","q","e","z");
array_multisort($a,$b);
var_dump($a);
var_dump($b);
?>

array(5) { [0]=> int(0) [1]=> int(10) [2]=> int(50) [3]=> int(80) [4]=> int(100) }
array(5) { [0]=> string(1) “z” [1]=> string(1) “e” [2]=> string(1) “q” [3]=> string(1) “f” [4]=> string(1) “c” }

$arr = array(    
 
    'index'=>array( 'name'=>'首页','order'=>3),
 
    'intro'=>array( 'name'=>'企业概况','order'=>2),
 
    'news'=>array( 'name'=>'新闻动态','order'=>1 ),
 
    'product'=>array( 'name'=>'产品中心','order'=>4 ),
 
    'message'=>array( 'name'=>'访客留言','order'=>7 ),
 
    'position'=>array( 'name'=>'人才招聘','order'=>6),
 
    'contact'=>array( 'name'=>'联系我们','order'=> 5 )
 
);
 
uasort($arr, 'cmp');
 
public function cmp($a, $b){
 
   return $a['order'] - $b['order'];
 
}