PHP Generate thumbnail image

/**
* Generate thumbnail image
* @param string Source graph absolute full address {with file name and suffix name}
* @param string Target graph absolute full address {with file name and suffix name}
* @param int thumbnail width {0: At this point the target height cannot be 0, the target width is the source plot width * (target height/source graph height)}
* @param int thumbnail height {0: At this time the target width cannot be 0, the target height is the source graph high * (target width/source wide chart)}
* @param int is cut {width, height must not 0}
* @param int/float Zoom {0: Not scaled, 0<this<1: Zoom to the appropriate scale (at which time the width and height limits and cropping are invalidated)}
* @return Boolean
*/
public static function Img2thumb ($src _img, $dst _img, $width =, $height = 0, $cut = 0, $proportion
{
if (!is_file ($src _img))
{
return false;
}
Echo ' CCCCCC '. " \ n ";
$ot = Commonmethod::fileext ($dst _img);
$otfunc = ' image '. ($ot = = ' jpg '? ' JPEG ': $ot);
$srcinfo = getimagesize ($src _img);
$SRC _w = $srcinfo [0];
$SRC _h = $srcinfo [1];
$type = Strtolower (substr (Image_type_to_extension ($srcinfo [2]), 1));
$createfun = ' Imagecreatefrom '. ($type = = ' jpg '? ' JPEG ': $type);

$DST _h = $height;
$DST _w = $width;
$x = $y = 0;

/**
* Thumbnails do not exceed the size of the source map (provided that there is only one width or height)
*/
if ($width > $src _w && $height > $src _h) | | ($height > $src _h && $width = = 0) | | ($width > $src _w && $height = = 0))
{
$proportion = 1;
}
if ($width > $src _w)
{
$dst _w = $width = $src _w;
}
if ($height > $src _h)
{
$DST _h = $height = $src _h;
}
if (! $width &&! $height &&! $proportion)
{
return false;
}
if (! $proportion)
{
if ($cut = = 0)
{
if ($dst _w && $dst _h)
{
if ($dst _w/$src _w> $dst _h/$src _h)
{
$DST _w = $src _w * ($dst _h/$src _h);
$x = 0-($dst _w-$width)/2;
}
Else
{
$DST _h = $src _h * ($dst _w/$src _w);
$y = 0-($dst _h-$height)/2;
}
}
else if ($dst _w xor $dst _h)
{
if ($DST _w &&! $DST _h)//Width No height
{
$propor = $dst _w/$src _w;
$height = $dst _h = $src _h * $PROPOR;
}
else if (! $DST _w && $dst _h)//with high or no width
{
$propor = $dst _h/$src _h;
$width = $dst _w = $src _w * $PROPOR;
}
}
}
Else
{
if (! $DST _h)//crop without high
{
$height = $dst _h = $dst _w;
}
if (! $DST _w)//no width when cropping
{
$width = $dst _w = $DST _h;
}
$propor = min (max ($dst _w/$src _w, $dst _h/$src _h), 1);
$DST _w = (int) round ($src _w * $propor);
$DST _h = (int) round ($src _h * $propor);
$x = ($width-$dst _w)/2;
$y = ($height-$dst _h)/2;
}
}
Else
{
$proportion = min ($proportion, 1);
$height = $dst _h = $src _h * $proportion;
$width = $dst _w = $src _w * $proportion;
}

$SRC = $createfun ($src _img);
$DST = Imagecreatetruecolor ($width? $width: $dst _w, $height? $height: $dst _h);
$white = Imagecolorallocate ($DST, 255, 255, 255);
Imagefill ($dst, 0, 0, $white);
Echo ' 11111 '. \ n ";
if (function_exists (' imagecopyresampled '))
{
Imagecopyresampled ($DST, $SRC, $x, $y, 0, 0, $dst _w, $dst _h, $src _w, $src _h);
}
Else
{
Imagecopyresized ($DST, $SRC, $x, $y, 0, 0, $dst _w, $dst _h, $src _w, $src _h);
}
Echo ' 222222 '. \ n ";
$otfunc ($DST, $dst _img);
Imagedestroy ($DST);
Imagedestroy ($SRC);
return true;
}

PHP Generate thumbnail image