PHP压缩图片
时间：2021-07-01 10:21:17
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- function scale_dimensions_within_limits($w,$h,$max_w,$max_h){
- // $w is the width of the current rectangle
- // $h is the height of the current rectangle
- // $max_w is the maximum width that an image can be sized
- // $max_h is the maximum height that an image can be sized
- // **** Here's where the magic is starts ****
- // Switch the concept of horiz/vertical/square to long/short side
- $short_side_len = ($w < $h ? $w : $h);
- $long_side_len = ($w > $h ? $w : $h);
- // Set a variable to the variable name of the output variable
- $ssvar = ($w > $h ? 'h':'w');
- $lsvar = ($w > $h ? 'w':'h');
- $maxLSvar = "max_".$lsvar;
- $maxSSvar = "max_".$ssvar;
- // Do the first pass on the long side
- $ratio = $$maxLSvar/$long_side_len;
- $newSS = round($short_side_len * $ratio);
- $newLS = round($long_side_len * $ratio);
- // *** Note - the only coditional block!
- // If short side is still out of limit, limit the short side and adjust
- if($newSS > $$maxSSvar){
- $ratio = $$maxSSvar/$newSS;
- $newLS = round($ratio*$newLS);
- $newSS = $$maxSSvar;
- }
- // **** Here's where the magic ends ****
- // Re-couple the h/w (or w/h) with the long/shortside counterparts
- // $$ means it's a variable variable (dynamic assignment)
- $$ssvar = $newSS;
- $$lsvar = $newLS;
- // Prep the return array
- $dimensions['w'] = $w; // this is derived from either $ssvar or $lsvar
- $dimensions['h'] = $h; return $dimensions;
- }
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