Pastable version of Trim an image vertically

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            <pre class="sunburst">&lt;?php

<span style="color:#99CF50;">function</span> <span style="color:#89BDFF;">imagetrim</span>(&amp;<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im</span>){
  <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>bg</span> <span style="color:#E28964;">=</span> <span style="color:#DAD085;">imagecolorallocate</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im</span>, <span style="color:#3387CC;">255</span>, <span style="color:#3387CC;">255</span>, <span style="color:#3387CC;">255</span>)<span style="color:#E28964;">;</span> <span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">//</span> white</span>
    
  <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>width</span> <span style="color:#E28964;">=</span> <span style="color:#DAD085;">imagesx</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im</span>)<span style="color:#E28964;">;</span>
  <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>height</span> <span style="color:#E28964;">=</span> <span style="color:#DAD085;">imagesy</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im</span>)<span style="color:#E28964;">;</span>

<span style="color:#E28964;">foreach</span> (<span style="color:#DAD085;">range</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>height</span> <span style="color:#E28964;">-</span> <span style="color:#3387CC;">1</span>, <span style="color:#3387CC;">0</span>) <span style="color:#E28964;">as</span> <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>y</span>)
    <span style="color:#E28964;">foreach</span> (<span style="color:#DAD085;">range</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>width</span> <span style="color:#E28964;">-</span> <span style="color:#3387CC;">1</span>, <span style="color:#3387CC;">0</span>) <span style="color:#E28964;">as</span> <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>x</span>)
      <span style="color:#E28964;">if</span> (<span style="color:#DAD085;">imagecolorat</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im</span>, <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>x</span>, <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>y</span>) <span style="color:#E28964;">!</span><span style="color:#E28964;">=</span> <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>bg</span>)
        <span style="color:#E28964;">break</span> <span style="color:#3387CC;">2</span><span style="color:#E28964;">;</span>

<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im2</span> <span style="color:#E28964;">=</span> <span style="color:#DAD085;">imagecreatetruecolor</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>width</span>, <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>y</span>)<span style="color:#E28964;">;</span>
  <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>bg2</span> <span style="color:#E28964;">=</span> <span style="color:#DAD085;">imagecolorallocate</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im2</span>, <span style="color:#3387CC;">255</span>, <span style="color:#3387CC;">255</span>, <span style="color:#3387CC;">255</span>)<span style="color:#E28964;">;</span> <span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">//</span> white</span>
  <span style="color:#DAD085;">imagefill</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im2</span>, <span style="color:#3387CC;">0</span>, <span style="color:#3387CC;">0</span>, <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>bg2</span>)<span style="color:#E28964;">;</span>
  <span style="color:#DAD085;">imagecopy</span>(<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im2</span>, <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im</span>, <span style="color:#3387CC;">0</span>, <span style="color:#3387CC;">0</span>, <span style="color:#3387CC;">0</span>, <span style="color:#3387CC;">0</span>, <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>width</span>, <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>y</span>)<span style="color:#E28964;">;</span>

<span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im</span> <span style="color:#E28964;">=</span> <span style="color:#3E87E3;"><span style="color:#3E87E3;">$</span>im2</span><span style="color:#E28964;">;</span>
}
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