How to generate thumbnails in php without distortion

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This article operating environment: Windows7 system, PHP7.1 version, DELL G3 computer

How does php generate thumbnails without distortion?

Use the php function to generate undistorted code for picture thumbnails

/ / generate thumbnails without distortion / * generate thumbnails * $imgSrc picture source path * $resize_width picture width * $resize_height picture height * $dstimg thumbnail path * $isCut whether to cut the picture * / function reSizeImg ($imgSrc, $resize_width, $resize_height, $dstimg $isCut = false) {/ / the type of picture $type = substr (strrchr ($imgSrc, "."), 1) / / initialize the image if ($type = = "jpg" | | $type = = "jpeg") {$im = imagecreatefromjpeg ($imgSrc);} if ($type = = "gif") {$im = imagecreatefromgif ($imgSrc);} if ($type = "png") {$im = imagecreatefrompng ($imgSrc);} $width = imagesx ($im) $height = imagesy ($im); / / generate image / / the ratio of the changed image $resize_ratio = ($resize_width) / ($resize_height); / / the ratio of the actual image $ratio = ($width) / ($height) If (($isCut) = = 1) {if ($ratio > = $resize_ratio) {/ / High priority $newimg = imagecreatetruecolor ($resize_width, $resize_height); imagecopyresampled ($newimg, $im, 0,0,0,0, $resize_width, $resize_height, (($height) * $resize_ratio), $height); ImageJpeg ($newimg, $dstimg) } if ($ratio

< $resize_ratio) { //宽度优先 $newimg = imagecreatetruecolor($resize_width, $resize_height); imagecopyresampled($newimg, $im, 0, 0, 0, 0, $resize_width, $resize_height, $width, (($width) / $resize_ratio)); ImageJpeg($newimg, $dstimg); } } else { if ($ratio >

= $resize_ratio) {$newimg = imagecreatetruecolor ($resize_width, ($resize_width) / $ratio); imagecopyresampled ($newimg, $im, 0,0,0,0, $resize_width, ($resize_width) / $ratio, $width, $height); ImageJpeg ($newimg, $dstimg) } if ($ratio < $resize_ratio) {$newimg = imagecreatetruecolor (($resize_height) * $ratio, $resize_height); imagecopyresampled ($newimg, $im, 0,0,0,0, ($resize_height) * $ratio, $resize_height, $width, $height); ImageJpeg ($newimg, $dstimg);} ImageDestroy ($im) } $result = reSizeImg ('images/15M.jpg', 1280, 1280 camera thumbpin Xiao15.jpg'); this is how php generates thumbnails without distortion, and more content related to how php generates thumbnails without distortion can search the previous articles or browse the following articles to learn! I believe the editor will add more knowledge to you. I hope you can support it!