PHP generates a picture thumbnail function

The specific usage is as follows:

$a =thumbimage (' 1.jpg ', 200,100, ' 2.jpg '), and/or 1.jpg generates a thumbnail with a width of 200, a height of 100, and is saved as a 2.jpg
print_r ($a);

Print results:

Array (
[Status] => 0
[File] => 1.jpg
[Width] => 200
[Height] => 200
[Savepath] => 2.jpg
[INFO] => thumbnail image generation success
)

$a =thumbimage (' 1.jpg ', 200,100);//1.jpg to generate a width of 200, high 100 thumbnail, and directly overwrite 1.jpg, do not generate new pictures

The function code is as follows:

<?php/* *php a function *www to generate a picture thumbnail. alixixi.com/function Thumbimage ($file, $thumbWidth, $thumbHeight, $savePath = ', $isCut =true, $quality =100) {$result =
	Array (' status ' =>0, ' file ' => ', ' width ' =>0, ' height ' =>0, ' savepath ' => ', ' info ' => '); if (!file_exists ($file)) {return array (' status ' =>1, ' file ' => ', ' width ' =>0, ' height ' =>0, ' Savepath ' => ')
	', ' info ' => ' picture file does not exist ');
	//detection file type $fp =fopen ($file, ' RB '); $str =fread ($FP, 2);
	Read Only 2 bytes fclose ($fp);
	$str = @unpack ("C2chars", $str);
	$typeCode =intval ($str [' chars1 ']. $str [' chars2 ']);
	$fileType = ';
		Switch ($typeCode) {case 255216: $fileType = ' jpg ';
		Break
		Case 7173: $fileType = ' gif ';
		Break
		Case 6677: $fileType = ' bmp ';
		Break
		Case 13780: $fileType = ' png ';
		Break
		Default: $fileType = $typeCode;
	Break
	} if ($str [' chars1 ']== '-1 ' && $str [' chars2 ']== ' -40 ') {$fileType = ' jpg ';
	} if ($str [' chars1 ']== ' -119 ' && $str [' chars2 ']== ') {$fileType = ' png '; } if (!in_array ($fileType, array (' jpg ', ' gif', ' BMP ', ' png ')} {return array (' status ' =>2, ' file ' => ', ' width ' =>0, ' height ' =>0, ' Savepath ' => ') ', '
	Info ' => ' picture file type is incorrect: '. $fileType);
	//Picture Scaling Process if ($fileType = = ' jpg ') {$im =imagecreatefromjpeg ($file);
	} if ($fileType = = ' gif ') {$im =imagecreatefromgif ($file);
	} if ($fileType = = ' png ') {$im =imagecreatefrompng ($file);
	if (empty ($savePath)) $savePath = $file;
	$width =imagesx ($im);
	$height =imagesy ($im); if ($width < $thumbWidth && $height < $thumbHeight) {return array (' status ' =>3, ' file ' => ', ' width ' =
	>0, ' height ' =>0, ' savepath ' => ', ' info ' => ' picture size less than the size of the generated thumbnail '); $ratio = $width/$height//The proportions of the actual image $thumbRatio = $thumbWidth/$thumbHeight;//The proportions of the changed image if ($isCut) {//Trim process if (function_
		Exists (' imagepng ') && (Str_replace ('. ', ', php_version) >=512)) {//For the PHP version is greater than 5.12 parameter changes after the processing $quality = 9;
			} if ($ratio >= $thumbRatio) {//High priority $newimg =imagecreatetruecolor ($thumbWidth, $thumbHeight); Imagecopyresampled ($newimg, $im, 0,0,0,0, $thumbWidth, $thumbHeight,(($height) * $thumbRatio), $height);
		Imagejpeg ($newimg, $savePath, $quality);
			} if ($ratio < $thumbRatio) {//Width first $newimg =imagecreatetruecolor ($thumbWidth, $thumbHeight);
			Imagecopyresampled ($newimg, $im, 0,0,0,0, $thumbWidth, $thumbHeight, $width, (($width)/$thumbRatio));
		Imagejpeg ($newimg, $savePath, $quality);
			}else{//does not trim process if ($ratio >= $thumbRatio) {$newimg =imagecreatetruecolor ($thumbWidth, ($thumbWidth)/$ratio);
			Imagecopyresampled ($newimg, $im, 0,0,0,0, $thumbWidth, ($thumbWidth)/$ratio, $width, $height);
		Imagejpeg ($newimg, $savePath, $quality);
			} if ($ratio < $thumbRatio) {$newimg =imagecreatetruecolor ($thumbHeight) * $ratio, $thumbHeight);
			Imagecopyresampled ($newimg, $im, 0,0,0,0, ($thumbHeight) * $ratio, $thumbHeight, $width, $height);
		Imagejpeg ($newimg, $savePath, $quality); } Imagedestroy ($im); alixixi.com/php-function/1007.html return Array (' status ' =>0, ' file ' => $file, ' width ' => $thumbWidth, ' height ' => $thumbHeight, ' Savepath ' => $savePath, ' info ' =&Gt; '
Thumbnail image generation Success '); }

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