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    <p>Any non-empty string evaluates to true and an empty string evaluates to false. The following script might shed some light for you:</p> <pre><code>&lt;?php if('true' == true) { echo "'true' == true"; } else { echo "'true' != true"; } echo '&lt;br /&gt;'; if('false' == true) { echo "'false' == true"; } else { echo "'false' != true"; } echo '&lt;br /&gt;'; if('foo' == true) { echo "'foo' == true"; } else { echo "'foo' != true"; } echo '&lt;br /&gt;'; if('false' == false) { echo "'false' == false"; } else { echo "'false' != false"; } echo '&lt;br /&gt;'; if('' == true) { echo "'' == true"; } else { echo "'' != true"; } echo '&lt;br /&gt;'; if('' == false) { echo "'' == false"; } else { echo "'' != false"; } ?&gt; </code></pre> <p>Here is the output:</p> <pre><code>'true' == true 'false' == true 'foo' == true 'false' != false '' != true '' == false </code></pre> <p>As requested, here are some more examples comparing == with === for various values.</p> <pre><code>&lt;?php echo "&lt;b&gt;'true' vs. true&lt;/b&gt;&lt;br /&gt;"; if('true' == true) { echo "'true' == true&lt;br /&gt;"; } else { echo "'true' != true&lt;br /&gt;"; } if('true' === true) { echo "'true' === true&lt;br /&gt;"; } else { echo "'true' !== true&lt;br /&gt;"; } echo "&lt;br /&gt;&lt;b&gt;'false' vs. true&lt;/b&gt;&lt;br /&gt;"; if('false' == true) { echo "'false' == true&lt;br /&gt;"; } else { echo "'false' != true&lt;br /&gt;"; } if('false' === true) { echo "'false' === true&lt;br /&gt;"; } else { echo "'false' !== true&lt;br /&gt;"; } echo "&lt;br /&gt;&lt;b&gt;1 vs. true&lt;/b&gt;&lt;br /&gt;"; if(1 == true) { echo "1 == true&lt;br /&gt;"; } else { echo "1 != true&lt;br /&gt;"; } if(1 === true) { echo "1 === true&lt;br /&gt;"; } else { echo "1 !== true&lt;br /&gt;"; } echo "&lt;br /&gt;&lt;b&gt;0 vs. false&lt;/b&gt;&lt;br /&gt;"; if(0 == false) { echo "0 == false&lt;br /&gt;"; } else { echo "0 != false&lt;br /&gt;"; } if(0 === false) { echo "0 === false&lt;br /&gt;"; } else { echo "0 !== false&lt;br /&gt;"; } echo "&lt;br /&gt;&lt;b&gt;1 vs. 'true'&lt;/b&gt;&lt;br /&gt;"; if(1 == 'true') { echo "1 == 'true'&lt;br /&gt;"; } else { echo "1 != 'true'&lt;br /&gt;"; } if(1 === 'true') { echo "1 === 'true'&lt;br /&gt;"; } else { echo "1 !== 'true'&lt;br /&gt;"; } echo "&lt;br /&gt;&lt;b&gt;empty string '' vs. false&lt;/b&gt;&lt;br /&gt;"; if('' == false) { echo "'' == false&lt;br /&gt;"; } else { echo "'' != false&lt;br /&gt;"; } if('' === true) { echo "'' === false&lt;br /&gt;"; } else { echo "'' !== false&lt;br /&gt;"; } ?&gt; </code></pre> <p>Output:</p> <p><strong>'true' vs. true</strong></p> <pre><code>'true' == true 'true' !== true </code></pre> <p><strong>'false' vs. true</strong></p> <pre><code>'false' == true 'false' !== true </code></pre> <p><strong>1 vs. true</strong></p> <pre><code>1 == true 1 !== true </code></pre> <p><strong>0 vs. false</strong></p> <pre><code>0 == false 0 !== false </code></pre> <p><strong>1 vs. 'true'</strong></p> <pre><code>1 != 'true' 1 !== 'true' </code></pre> <p><strong>empty string '' vs. false</strong></p> <pre><code>'' == false '' !== false </code></pre>
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    1. POPHP true & 'true' difference
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    1. COCan you add in some examples with === for a more comprehensive demonstration?
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    2. COExamples added as requested, let me know if there are any others you'd explicitely like to see.
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