title: Unexpected behavior from str_replace()
body: <p>I have two arrays. One with color names and the other with the RGB values.</p>
  
  <p>I am converting a color name to it's RGB value using <code>str_replace()</code> (then doing some other stuff with it). </p>
  
  <p>All of the colours work as expected, except <code>Pale Yellow</code>.</p>
  
  <pre><code>$colour = "Pale Yellow";
  $RGBint     = array('Red'      ,'Burgundy','Rust'     ,'Electric Orange','Pumpkin'    ,'Melon'     ,'Baby Pink'  ,'Candy Floss Pink','Electric Pink','Yellow'    ,'Pale Yellow','Golden'    ,'Lime'     ,'Kiwi'       ,'Mint'       ,'Dragonfly Green','Kelly Green','Fern'       ,'Forest Green','Olive'     ,'Teal'      ,'Baby Blue'  ,'Dragonfly Blue','Cornflower' ,'Medium Blue','Royal Blue','Electric Blue','Navy'    ,'Lavender'   ,'Lilac'     ,'Purple'  ,'Plum'      ,'Dark Brown','Chocolate Brown','Light Brown','Copper'   ,'Beige'      ,'Linen'      ,'Taupe'      ,'Shimmer'    ,'Silver'     ,'Medium Grey','Charcoal'   ,'Black', 'White'     , 'Off White' , 'Neon Light Orange','Neon Orange','Neon Light Pink','Neon Dark Pink','Neon Yellow','Neon Green');
  $ColourName = array("200,16,46","166,9,61","150,56,33","255,106,19"     ,"255,141,109","255,181,73","245,222,218","245,155,187"     ,"239,74,129"   ,"253,218,36","250,224,83" ,"203,160,82","206,220,0","142,221,101","128,224,167","169,196,127"    ,"0,132,61"   ,"142,221,101","0,87,63"     ,"103,130,58","39,153,137","171,202,233","189,214,230"   ,"123,175,212","95,143,180" ,"0,51,160"  ,"0,125,186"    ,"20,27,77","149,149,210","144,99,205","51,0,114","140,71,153","99,81,61"  ,"105,63,35"      ,"134,109,75" ,"115,56,29","219,200,182","176,170,126","138,126,112","208,211,212","162,172,171","142,144,137","112,115,114","0,0,0","255,255,255","227,223,195","255,170,77"        ,"255,143,108","255,95,162"     ,"239,66,111"    ,"224,231,33" ,"255,233,0");
  $RGBvalue = str_replace($RGBint, $ColourName, $colour);
  die($RGBvalue);
  </code></pre>
  
  <p>Expected result:</p>
  
  <pre><code>250,224,83
  </code></pre>
  
  <p>Actual result:  </p>
  
  <pre><code>Pale 250,224,83
  </code></pre>
  
  <p>I don't understand why it is picking up "Pale" in the result, this isn't the only two word color, and the others work fine.</p>
  
  <p>I can't see anything obvious as to why this is happening, What am I missing?</p>