php對(duì)圖像的各種處理函數(shù)代碼小結(jié)(2)_PHP教程

推薦：PHP 關(guān)于訪問(wèn)控制的和運(yùn)算符優(yōu)先級(jí)介紹
這篇文章主要介紹了PHP中關(guān)于訪問(wèn)控制的和運(yùn)算符優(yōu)先級(jí)介紹，需要的朋友可以參考下 復(fù)制代碼 代碼如下: class Foo { private $name = 'hdj'; public function getName(){ return $this-name; } } class Bar extends Foo { public $name = 'deeka'; } $bar = new Bar; va

//圖片水印
function mark_pic($background, $waterpic, $x, $y){
$back=imagecreatefromjpeg($background);
$water=imagecreatefromgif($waterpic);
$w_w=imagesx($water);
$w_h=imagesy($water);
imagecopy($back, $water, $x, $y, 0, 0, $w_w, $w_h);
imagejpeg($back,"./images/hee8.jpg");
imagedestroy($back);
imagedestroy($water);
}
mark_pic("./images/hee.jpg", "./images/gaolf.gif", 50, 200);

圖片旋轉(zhuǎn)

復(fù)制代碼 代碼如下:
$back=imagecreatefromjpeg("./images/hee.jpg");
 $new=imagerotate($back, 45, 0);
 imagejpeg($new, "./images/hee9.jpg");

圖片水平翻轉(zhuǎn)垂直翻轉(zhuǎn)

復(fù)制代碼 代碼如下:
function turn_y($background, $newfile){
  $back=imagecreatefromjpeg($background);

  $width=imagesx($back);
  $height=imagesy($back);

  $new=imagecreatetruecolor($width, $height);

  for($x=0; $x < $width; $x++){
   imagecopy($new, $back, $width-$x-1, 0, $x, 0, 1, $height);
  }

  imagejpeg($new, $newfile);

  imagedestroy($back);
  imagedestroy($new);
 }

 function turn_x($background, $newfile){
  $back=imagecreatefromjpeg($background);

  $width=imagesx($back);
  $height=imagesy($back);

  $new=imagecreatetruecolor($width, $height);

  for($y=0; $y < $height; $y++){
   imagecopy($new, $back,0, $height-$y-1, 0, $y, $width, 1);
  }

  imagejpeg($new, $newfile);

  imagedestroy($back);
  imagedestroy($new);
 }

 turn_y("./images/hee.jpg", "./images/hee11.jpg");
 turn_x("./images/hee.jpg", "./images/hee12.jpg");

 圖片銳化

復(fù)制代碼 代碼如下:

function sharp($background, $degree, $save){
 $back=imagecreatefromjpeg($background);

 $b_x=imagesx($back);
 $b_y=imagesy($back);

 $dst=imagecreatefromjpeg($background);
 for($i=0; $i<$b_x; $i++){
  for($j=0; $j<$b_y; $j++){
   $b_clr1=imagecolorsforindex($back, imagecolorat($back, $i-1, $j-1));\\前一個(gè)像素顏色數(shù)組
   $b_clr2=imagecolorsforindex($back, imagecolorat($back, $i, $j));\\取出當(dāng)前顏色數(shù)組

   $r=intval($b_clr2["red"]+$degree*($b_clr2["red"]-$b_clr1["red"]));\\加深
   $g=intval($b_clr2["green"]+$degree*($b_clr2["green"]-$b_clr1["green"]));
   $b=intval($b_clr2["blue"]+$degree*($b_clr2["blue"]-$b_clr1["blue"]));

   $r=min(255, max($r, 0));//限制r范圍在0-255之間
   $g=min(255, max($g, 0));
   $b=min(255, max($b, 0));

   if(($d_clr=imagecolorexact($dst, $r, $g, $b))==-1){//等于1不在顏色范圍內(nèi)
    $d_clr=Imagecolorallocate($dst, $r, $g, $b);//創(chuàng)建一個(gè)顏色
   }

   imagesetpixel($dst, $i, $j, $d_clr);
  }

 }
 imagejpeg($dst, $save);
 imagedestroy($back);
 imagedestroy($dst);
}

sharp("./images/hee.jpg", 20, "./images/hee13.jpg");

分享：關(guān)于PHP語(yǔ)言構(gòu)造器介紹
PHP里有echo、print、die、require等幾個(gè)特殊的關(guān)鍵字，雖然它們用起來(lái)像是函數(shù)，但實(shí)際上更類似于if、while這樣控制語(yǔ)句，而不是一個(gè)函數(shù)。也就是說(shuō)，當(dāng)解釋器遇到： 復(fù)制代碼 代碼如下: print 'Hello world'; 這樣的一個(gè)表達(dá)式的時(shí)候，并不會(huì)把它轉(zhuǎn)換成函數(shù)調(diào)用，而