php-doc-en/reference/strings/functions/str-split.xml

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<!-- $Revision: 1.1 $ -->
  <refentry id="function.str-split">
   <refnamediv>
    <refname>str_split</refname>
    <refpurpose>
     Convert a string to an array
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>array</type><methodname>str_split</methodname>
     <methodparam><type>string</type><parameter>string</parameter></methodparam>
     <methodparam choice="opt"><type>int</type><parameter>split_length</parameter></methodparam>
    </methodsynopsis>
    <para>
     Converts a string to an array. If the optional
     <parameter>split_length</parameter> parameter is specified, the
     returned array will be broken down into chunks with each being
     <parameter>split_length</parameter> in length, otherwise each chunk
     will be one character in length.
    </para>
    <para>
     &false; is returned if <parameter>split_length</parameter> is less
     than 1.  If the <parameter>split_length</parameter> length exceeds the
     length of <parameter>string</parameter>, the entire string is returned
     as the first (and only) array element.
    </para>
    <para>
     <example>
      <title>Example uses of <function>str_split</function></title>
      <programlisting role="php">
<![CDATA[
<?php

$str = "Hello Friend";

$arr1 = str_split($str);
$arr2 = str_split($str, 3);

print_r($arr1);
print_r($arr2);

/* Output may look like:

Array
(
    [0] => H
    [1] => e
    [2] => l
    [3] => l
    [4] => o
    [5] =>
    [6] => F
    [7] => r
    [8] => i
    [9] => e
    [10] => n
    [11] => d
)

Array
(
    [0] => Hel
    [1] => lo 
    [2] => Fri
    [3] => end
)
*/
?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     <example>
      <title>Examples related to <function>str_split</function></title>
      <programlisting role="php">
<![CDATA[
<?php

$str = "Hello Friend";

print $str{0};  // H
print $str{8};  // i

// Creates: array('H','e','l','l','o',' ','F','r','i','e','n','d')
$arr1 = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);

?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     See also <function>preg_split</function>,
     <function>split</function>,
     <function>count_chars</function>,
     <function>str_word_count</function>, and 
     <link linkend="control-structures.for">for</link>.
    </para>
   </refsect1>
  </refentry>

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