Source of: /manual/en/function.ctype-alpha.php
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<div id="function.ctype-alpha" class="refentry">
<div class="refnamediv">
<h1 class="refname">ctype_alpha</h1>
<p class="verinfo">(PHP 4 >= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">ctype_alpha</span> — <span class="dc-title">Check for alphabetic character(s)</span></p>
</div>
<a name="function.ctype-alpha.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><b>ctype_alpha</b></span>
( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$text</tt></span>
)</div>
<p class="para rdfs-comment">
Checks if all of the characters in the provided string,
<i><tt class="parameter">text</tt></i>
, are alphabetic.
In the standard <i>C</i> locale letters are just
<i>[A-Za-z]</i> and <b>ctype_alpha()</b> is
equivalent to <i>(ctype_upper($text) || ctype_lower($text))</i>
if $text is just a single character, but other languages have letters that
are considered neither upper nor lower case.
</p>
</div>
<a name="function.ctype-alpha.parameters"></a><div class="refsect1 parameters">
<h3 class="title">Parameters</h3>
<p class="para">
</p><dl>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">text</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
The tested string.
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.ctype-alpha.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <b><tt class="constant">TRUE</tt></b> if every character in <i><tt class="parameter">text</tt></i>
is
a letter from the current locale, <b><tt class="constant">FALSE</tt></b> otherwise.
</p>
</div>
<a name="function.ctype-alpha.examples"></a><div class="refsect1 examples">
<h3 class="title">Examples</h3>
<p class="para">
</p><div class="example">
<p><b>Example #1 A <b>ctype_alpha()</b> example (using the default locale)</b></p>
<div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$strings </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'KjgWZC'</span><span style="color: #007700">, </span><span style="color: #DD0000">'arf12'</span><span style="color: #007700">);<br />foreach (</span><span style="color: #0000BB">$strings </span><span style="color: #007700">as </span><span style="color: #0000BB">$testcase</span><span style="color: #007700">) {<br /> if (</span><span style="color: #0000BB">ctype_alpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$testcase</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"The string </span><span style="color: #0000BB">$testcase</span><span style="color: #DD0000"> consists of all letters.\n"</span><span style="color: #007700">;<br /> } else {<br /> echo </span><span style="color: #DD0000">"The string </span><span style="color: #0000BB">$testcase</span><span style="color: #DD0000"> does not consist of all letters.\n"</span><span style="color: #007700">;<br /> }<br />}<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents para"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
The string KjgWZC consists of all letters.
The string arf12 does not consist of all letters.
</pre></div>
</div>
</div><p>
</p>
</div>
<a name="function.ctype-alpha.seealso"></a><div class="refsect1 seealso">
<h3 class="title">See Also</h3>
<p class="para">
</p><ul class="simplelist">
<li class="member"><a href="function.ctype-upper.php" class="function" rel="rdfs-seeAlso">ctype_upper()</a> - Check for uppercase character(s)</li>
<li class="member"><a href="function.ctype-lower.php" class="function" rel="rdfs-seeAlso">ctype_lower()</a> - Check for lowercase character(s)</li>
<li class="member"><a href="function.setlocale.php" class="function" rel="rdfs-seeAlso">setlocale()</a> - Set locale information</li>
</ul><p>
</p>
</div>
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