PHP常用函数汇总

中文等多字节字符串翻转

$str = '字符串反转';

function rev($str, $encoding = 'utf-8'){
    $len = mb_strlen($str, $encoding);
    $result = '';

    for ($i = $len-1; $i>=0; $i--){
        $result.= mb_substr($str,$i,1,$encoding);
    }

    return $result;
}

echo rev($str);

生成圆形头像：

test('2.jpg','1.jpg'); #2原图 1生成图
function test($url,$path='./'){  
    $w = 100;  $h=100; // original size  
    $original_path= $url;  
    $dest_path = $path.uniqid().'.png';  
    $src = imagecreatefromstring(file_get_contents($original_path));  
    $newpic = imagecreatetruecolor($w,$h);  
    imagealphablending($newpic,false);  
    $transparent = imagecolorallocatealpha($newpic, 0, 0, 0, 127);  
    $r=$w/2;  
    for($x=0;$x<$w;$x++)  
        for($y=0;$y<$h;$y++){  
            $c = imagecolorat($src,$x,$y);  
            $_x = $x - $w/2;  
            $_y = $y - $h/2;  
            if((($_x*$_x) + ($_y*$_y)) < ($r*$r)){  
                imagesetpixel($newpic,$x,$y,$c);  
            }else{  
                imagesetpixel($newpic,$x,$y,$transparent);  
            }  
        }  
    imagesavealpha($newpic, true);  
    imagepng($newpic, $dest_path);  
    imagedestroy($newpic);  
    imagedestroy($src);  
   // unlink($url);  
    return $dest_path;  
} 

curl随机IP访问：

function curl($url,$ifpost = 0, $datafields = '', $cookiefile = '', $v = false){
    $ip_long = array(
        array('607649792', '608174079'), //36.56.0.0-36.63.255.255
        array('1038614528', '1039007743'), //61.232.0.0-61.237.255.255
        array('1783627776', '1784676351'), //106.80.0.0-106.95.255.255
        array('2035023872', '2035154943'), //121.76.0.0-121.77.255.255
        array('2078801920', '2079064063'), //123.232.0.0-123.235.255.255
        array('-1950089216', '-1948778497'), //139.196.0.0-139.215.255.255
        array('-1425539072', '-1425014785'), //171.8.0.0-171.15.255.255
        array('-1236271104', '-1235419137'), //182.80.0.0-182.92.255.255
        array('-770113536', '-768606209'), //210.25.0.0-210.47.255.255
        array('-569376768', '-564133889'), //222.16.0.0-222.95.255.255
    );
    $rand_key = mt_rand(0, 9);
    $ip= long2ip(mt_rand($ip_long[$rand_key][0], $ip_long[$rand_key][1]));


    $header = array("Connection: Keep-Alive","Accept: text/html, application/xhtml+xml, */*", "Pragma: no-cache", "Accept-Language: zh-Hans-CN,zh-Hans;q=0.8,en-US;q=0.5,en;q=0.3","User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)",'CLIENT-IP:'.$ip,'X-FORWARDED-FOR:'.$ip); 
    $ch = curl_init(); 
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_HEADER, $v); 
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header); 
    $ifpost && curl_setopt($ch, CURLOPT_POST, $ifpost); 
    $ifpost && curl_setopt($ch, CURLOPT_POSTFIELDS, $datafields); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); 
    $cookiefile && curl_setopt($ch, CURLOPT_COOKIEFILE, $cookiefile); 
    $cookiefile && curl_setopt($ch, CURLOPT_COOKIEJAR, $cookiefile); 
    curl_setopt($ch,CURLOPT_TIMEOUT,30); //允许执行的最长秒数
    $ok = curl_exec($ch); 
    curl_close($ch); 

    unset($ch);
    return $ok;

}
print_r(curl("https://www.r1989.com"));