php-doc-en/functions/ctype.xml

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 <reference id="ref.ctype">
  <title>Character type functions</title>
  <titleabbrev>ctype</titleabbrev>

  <partintro>
   <para>
    These functions check whether a character or string
    falls into a certain character class according to the
    current locale.
   </para>
   <para>
    When called with an integer argument these functions 
    behave exactly like their C counterparts.
   </para>
   <para>
    When called with a string argument they will check
    every character in the string and will only return
    &true; if every character in the string matches the
    requested criteria.
   </para>
   <para>
    Passing anything else but a string or integer will 
    return &false; immediately.
   </para>
  </partintro>


  <refentry id="function.ctype-alnum">
   <refnamediv>
    <refname>ctype_alnum</refname>
    <refpurpose>Check for alphanumeric character(s)</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_alnum</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
     See also <function>setlocale</function>.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-alpha">
   <refnamediv>
    <refname>ctype_alpha</refname>
    <refpurpose>Check for alphabetic character(s)</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_alpha</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-cntrl">
   <refnamediv>
    <refname>ctype_cntrl</refname>
    <refpurpose>Check for control character(s)</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_cntrl</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-digit">
   <refnamediv>
    <refname>ctype_digit</refname>
    <refpurpose>Check for numeric character(s)</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_digit</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-lower">
   <refnamediv>
    <refname>ctype_lower</refname>
    <refpurpose>Check for lowercase character(s)</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_lower</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-graph">
   <refnamediv>
    <refname>ctype_graph</refname>
    <refpurpose>Check for any printable character(s) except space</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_graph</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-print">
   <refnamediv>
    <refname>ctype_print</refname>
    <refpurpose>Check for printable character(s)</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_print</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-punct">
   <refnamediv>
    <refname>ctype_punct</refname>
    <refpurpose>
     Check for any printable character which is not whitespace or an
     alphanumeric character
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_punct</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-space">
   <refnamediv>
    <refname>ctype_space</refname>
    <refpurpose>Check for whitespace character(s)</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_space</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-upper">
   <refnamediv>
    <refname>ctype_upper</refname>
    <refpurpose>Check for uppercase character(s)</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_upper</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.ctype-xdigit">
   <refnamediv>
    <refname>ctype_xdigit</refname>
    <refpurpose>
     Check for character(s) representing a hexadecimal digit
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>ctype_xdigit</methodname>
     <methodparam><type>string</type><parameter>c</parameter></methodparam>
     </methodsynopsis>
    <para>
    </para>
   </refsect1>
  </refentry>

 </reference>

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