php等比例產生縮圖

簡介：這是php等比例產生縮圖的詳細頁面，介紹了和php,有關的知識、技巧、經驗，和一些php源碼等。

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function reSizeImg($imgSrc, $resize_width, $resize_height, $isCut=false) {//圖片的類型$type = substr ( strrchr ( $imgSrc, "." ), 1 );//初始化圖象if ($type == "jpg") {$im = imagecreatefromjpeg ( $imgSrc );}if ($type == "gif") {$im = imagecreatefromgif ( $imgSrc );}if ($type == "png") {$im = imagecreatefrompng ( $imgSrc );}//靶心圖表象地址$full_length = strlen ( $imgSrc );$type_length = strlen ( $type );$name_length = $full_length - $type_length;$name = substr ( $imgSrc, 0, $name_length - 1 );$dstimg = $name . "_s." . $type;$width = imagesx ( $im );$height = imagesy ( $im );//產生圖象//改變後的圖象的比例$resize_ratio = ($resize_width) / ($resize_height);//實際圖象的比例$ratio = ($width) / ($height);if (($isCut) == 1) //裁圖{if ($ratio >= $resize_ratio) //高度優先{$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 < $resize_ratio) //寬度優先{$newimg = imagecreatetruecolor ( $resize_width, $resize_height );imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, $resize_width, $resize_height, $width, (($width) / $resize_ratio) );ImageJpeg ( $newimg, $dstimg );}} else //不裁圖{if ($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 );}

　　

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