php簡易縮圖處理程式碼
阿新 • • 發佈:2019-01-04
此程式碼是網上搜到的,可以快速的做出縮圖
stand_test.php
<?php // http://localhost/exa5/thumb_image/thumb_stand.php?w=200&h=200 // 把大圖縮略到縮圖指定的範圍內,可能有留白(原圖細節不丟失) $w = $_GET['w']?$_GET['w']:200; $h = $_GET['h']?$_GET['h']:200; $filename = "stand_test_".$w."_".$h.".jpg";//輸出到的位置 $loc_img='test.jpg';//本地圖片 image_resize( $loc_img,$filename,$w, $h); header("content-type:image/png");//設定生成圖片格式 echo file_get_contents($filename); function image_resize($f, $t, $tw, $th){ // 按指定大小生成縮圖,而且不變形,縮圖函式 $temp = array(1=>'gif', 2=>'jpeg', 3=>'png'); list($fw, $fh, $tmp) = getimagesize($f); if(!$temp[$tmp]){ return false; } $tmp = $temp[$tmp]; $infunc= "imagecreatefrom$tmp"; $outfunc = "image$tmp"; $fimg = $infunc($f); // 使縮略後的圖片不變形,並且限制在 縮圖寬高範圍內 if($fw/$tw > $fh/$th){ $th = $tw*($fh/$fw); }else{ $tw = $th*($fw/$fh); } $timg = imagecreatetruecolor($tw, $th); imagecopyresampled($timg, $fimg, 0,0, 0,0, $tw,$th, $fw,$fh); if($outfunc($timg, $t)){ return true; }else{ return false; } } ?>
thumb_cut.php
<?php // http://localhost/exa5/thumb_image/thumb_cut.php?w=200&h=200 // 把大圖縮略到縮圖指定的範圍內,不留白(原圖會居中縮放,把超出的部分裁剪掉) $w = $_GET['w']?$_GET['w']:200; $h = $_GET['h']?$_GET['h']:200; $filename = "cut_test_".$w."_".$h.".jpg";//輸出到的位置 $loc_img='test.jpg';//本地圖片 image_resize($loc_img ,$filename, $w, $h); header("content-type:image/png");//設定生成圖片格式 echo file_get_contents($filename); // 按指定大小生成縮圖,而且不變形,縮圖函式 function imageResize($f, $t, $tw, $th){ $temp = array(1=>'gif', 2=>'jpeg', 3=>'png'); list($fw, $fh, $tmp) = getimagesize($f); if(!$temp[$tmp]){ return false; } $tmp = $temp[$tmp]; $infunc = "imagecreatefrom$tmp"; $outfunc = "image$tmp"; $fimg = $infunc($f); // $fw = 10; // $fh = 4; // $tw = 4; // $th = 2; // 把圖片鋪滿要縮放的區域 if($fw/$tw > $fh/$th){ $zh = $th; $zw = $zh*($fw/$fh); $_zw = ($zw-$tw)/2; }else{ $zw = $tw; $zh = $zw*($fh/$fw); $_zh = ($zh-$th)/2; } // echo $zw."<br>"; // echo $zh."<br>"; // echo $_zw."<br>"; // echo $_zh."<br>"; // exit; $zimg = imagecreatetruecolor($zw, $zh); // 先把影象放滿區域 imagecopyresampled($zimg, $fimg, 0,0, 0,0, $zw,$zh, $fw,$fh); // 再擷取到指定的寬高度 $timg = imagecreatetruecolor($tw, $th); imagecopyresampled($timg, $zimg, 0,0, 0+$_zw,0+$_zh, $tw,$th, $zw-$_zw*2,$zh-$_zh*2); // if($outfunc($timg, $t)){ return true; }else{ return false; } } ?>
thumb_strict.php
<?php // http://localhost/exa5/thumb_image/thumb_strict.php?w=200&h=200 // 把大圖縮略到縮圖指定的範圍內,不留白(原圖會剪下掉不符合比例的右邊和下邊) $w = $_GET['w']?$_GET['w']:200; $h = $_GET['h']?$_GET['h']:200; $filename = "strict_test_".$w."_".$h.".jpg";//輸出到的位置 $loc_img='test.jpg';//本地圖片 image_resize( $loc_img,$filename, $w, $h); header("content-type:image/png");//設定生成圖片格式 echo file_get_contents($filename); function image_resize($f, $t, $tw, $th){ // 按指定大小生成縮圖,而且不變形,縮圖函式 $temp = array(1=>'gif', 2=>'jpeg', 3=>'png'); list($fw, $fh, $tmp) = getimagesize($f); if(!$temp[$tmp]){ return false; } $tmp = $temp[$tmp]; $infunc = "imagecreatefrom$tmp"; $outfunc = "image$tmp"; $fimg = $infunc($f); if($fw/$tw > $fh/$th){ $fw = $tw * ($fh/$th); }else{ $fh = $th * ($fw/$tw); } $timg = imagecreatetruecolor($tw, $th); imagecopyresampled($timg, $fimg, 0,0, 0,0, $tw,$th, $fw,$fh); if($outfunc($timg, $t)){ return true; }else{ return false; } } ?>