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    <ol> <li>Replace every string concatenation with the "." operator with an array push, for example array [ ] = "foo" and then return a string concatenation implode ( array );</li> <li><p>Use ob_start(); to cache the output:</p> <p>ob_start(); echo $a,$b,$c; $str = ob_get_contents(); ob_end_clean(); </p></li> <li><p>You can optimize if to switch and change the order to your expected result. For example if result a is more likely then result b the condition to catch result a should be the first condition.</p></li> <li>Put a primary key and secondary key on your table(s). </li> </ol> <p>1.1) Don't use a glue and don't add the construction of the array to the time. Here is a benchmark for <a href="http://www.sitecrafting.com/blog/php-string-concat-vs-array" rel="nofollow noreferrer">http://www.sitecrafting.com/blog/php-string-concat-vs-array</a> 1.2) <a href="http://dan.doezema.com/2011/07/php-output-profiling-echo-vs-concat" rel="nofollow noreferrer">http://dan.doezema.com/2011/07/php-output-profiling-echo-vs-concat</a> ( although echo is fastest concat is slower then array and also he uses a glue! 1.3) <a href="https://stackoverflow.com/questions">https://stackoverflow.com/questions</a> 1.4) <a href="http://www.sitepoint.com/high-performance-string-concatenation-in-php/" rel="nofollow noreferrer">http://www.sitepoint.com/high-performance-string-concatenation-in-php/</a></p> <pre><code> Here are my results (30000 strings, time in milliseconds) (Script is taken from 1.4): standard: 0.02418089 implode w/ glue: 0.00435901 implode w/o glue: 0.02205801 foreach: 0.02081609 </code></pre> <p>Conclusion: use implode with glue.</p>
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    1. COString concanecation is not really that slow; 2. point most likely does it all.
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    2. COYes it is. It slower than array push.
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    3. COI've corrected my answer!
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