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>ctype_alnum</H1
><DIV
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><A
NAME="AEN16167"
></A
><P
> (PHP 4 >= 4.0.4, PHP 5)</P
>ctype_alnum -- Check for alphanumeric character(s)</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN16170"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>ctype_alnum</B
> ( string text)<BR
></BR
><P
> Returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> if every character in <VAR
CLASS="parameter"
>text</VAR
> is either
a letter or a digit, <TT
CLASS="constant"
><B
>FALSE</B
></TT
> otherwise. In the standard <VAR
CLASS="literal"
>C</VAR
>
locale letters are just <VAR
CLASS="literal"
>[A-Za-z]</VAR
> and the function is
equivalent to <VAR
CLASS="literal"
>preg_match('/^[a-z0-9]*$/i', $text)</VAR
>.
</P
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><P
><B
>Exemplu 1. A <B
CLASS="function"
>ctype_alnum()</B
> example (using the default locale)</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br />$strings </font><font color="#007700">= array(</font><font color="#DD0000">'AbCd1zyZ9'</font><font color="#007700">, </font><font color="#DD0000">'foo!#$bar'</font><font color="#007700">);<br />foreach (</font><font color="#0000BB">$strings </font><font color="#007700">as </font><font color="#0000BB">$testcase</font><font color="#007700">) {<br /> if (</font><font color="#0000BB">ctype_alnum</font><font color="#007700">(</font><font color="#0000BB">$testcase</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"The string $testcase consists of all letters or digits.</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> } else {<br /> echo </font><font color="#DD0000">"The string $testcase does not consist of all letters or digits.</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> }<br />}<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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><P
> This example will output :
</P
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><PRE
CLASS="screen"
>The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consists of all letters or digits.</PRE
></TD
></TR
></TABLE
></DIV
></TD
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>
</P
><P
> See also <A
HREF="function.ctype-alpha.html"
><B
CLASS="function"
>ctype_alpha()</B
></A
>, <A
HREF="function.ctype-digit.html"
><B
CLASS="function"
>ctype_digit()</B
></A
>,
and <A
HREF="function.setlocale.html"
><B
CLASS="function"
>setlocale()</B
></A
>.
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