19个超实用的PHP代码片段(4)

function xcurl($url,$ref=null,$post=array(),$ua="Mozilla/5.0 (X11; Linux x86_64; rv:2.2a1pre) Gecko/20110324 Firefox/4.2a1pre",$print=false) { 
    $ch = curl_init(); 
    curl_setopt($ch, CURLOPT_AUTOREFERER, true); 
    if(!empty($ref)) { 
        curl_setopt($ch, CURLOPT_REFERER, $ref); 
    } 
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_HEADER, 0); 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    if(!empty($ua)) { 
        curl_setopt($ch, CURLOPT_USERAGENT, $ua); 
    } 
    if(count($post) > 0){ 
        curl_setopt($ch, CURLOPT_POST, 1); 
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post);     
    } 
    $output = curl_exec($ch); 
    curl_close($ch); 
    if($print) { 
        print($output); 
    } else { 
        return $output; 
    } 
}

12.清理用户输入

复制代码 代码如下:

<?php
function cleanInput($input) {

  $search = array(
    '@<script[^>]*?>.*?</script>@si',   // Strip out javascript
    '@<[\/\!]*?[^<>]*?>@si',            // Strip out HTML tags
    '@<style[^>]*?>.*?</style>@siU',    // Strip style tags properly
    '@<![\s\S]*?--[ \t\n\r]*>@'         // Strip multi-line comments
  );

    $output = preg_replace($search, '', $input);
    return $output;
  }
?>
<?php
function sanitize($input) {
    if (is_array($input)) {
        foreach($input as $var=>$val) {
            $output[$var] = sanitize($val);
        }
    }
    else {
        if (get_magic_quotes_gpc()) {
            $input = stripslashes($input);
        }
        $input  = cleanInput($input);
        $output = mysql_real_escape_string($input);
    }
    return $output;
}
?>

13.通过IP（城市、国家）检测地理位置

复制代码 代码如下:

function detect_city($ip) { 

        $default = 'Hollywood, CA'; 

        if (!is_string($ip) || strlen($ip) < 1 || $ip == '127.0.0.1' || $ip == 'localhost')             $ip = '8.8.8.8';           $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';           $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);         $ch = curl_init();           $curl_opt = array(             CURLOPT_FOLLOWLOCATION  => 1, 
            CURLOPT_HEADER      => 0, 
            CURLOPT_RETURNTRANSFER  => 1, 
            CURLOPT_USERAGENT   => $curlopt_useragent, 
            CURLOPT_URL       => $url, 
            CURLOPT_TIMEOUT         => 1, 
            CURLOPT_REFERER         => 'http://' . $_SERVER['HTTP_HOST'], 
        ); 

        curl_setopt_array($ch, $curl_opt); 

        $content = curl_exec($ch); 

        if (!is_null($curl_info)) { 
            $curl_info = curl_getinfo($ch); 
        } 

        curl_close($ch); 

        if ( preg_match('{ 

     
City : ([^<]*) 
}i', $content, $regs) ) { $city = $regs[1]; } if ( preg_match('{ 

State/Province : ([^<]*) 

}i', $content, $regs) ) { $state = $regs[1]; } if( $city!='' && $state!='' ){ $location = $city . ', ' . $state; return $location; }else{ return $default; } } 

14.设置密码强度

复制代码 代码如下: