boolval

Name:boolval

Category:Variable processing

Programming Language:php

One-line Description:Returns the Boolean value of the variable.

Example

Returns boolean values for different variables:

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"0: "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">boolval</span> <span class="token punctuation">(</span> <span class="token number">0</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;true&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;false&#39;</span> <span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"4: "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">boolval</span> <span class="token punctuation">(</span> <span class="token number">42</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;true&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;false&#39;</span> <span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">&#39;"": &#39;</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">boolval</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">""</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;true&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;false&#39;</span> <span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">&#39;"Hello": &#39;</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">boolval</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"Hello"</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;true&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;false&#39;</span> <span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">&#39;"0": &#39;</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">boolval</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"0"</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;true&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;false&#39;</span> <span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"[3, 5]: "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">boolval</span> <span class="token punctuation">(</span> <span class="token punctuation">[</span> <span class="token number">3</span> <span class="token punctuation">,</span> <span class="token number">5</span> <span class="token punctuation">]</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;true&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;false&#39;</span> <span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"[]: "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">boolval</span> <span class="token punctuation">(</span> <span class="token punctuation">[</span> <span class="token punctuation">]</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">&#39;true&#39;</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">&#39;false&#39;</span> <span class="token punctuation">)</span> <span class="token operator">.</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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