<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
  <refentry id="function.strspn">
   <refnamediv>
    <refname>strspn</refname>
    <refpurpose>
     Find length of initial segment matching mask
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>strspn</methodname>
      <methodparam><type>string</type><parameter>str1</parameter></methodparam>
      <methodparam><type>string</type><parameter>str2</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>start</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>length</parameter></methodparam>
     </methodsynopsis>
    <simpara>
     Returns the length of the initial segment of
     <parameter>str1</parameter> which consists entirely of characters
     in <parameter>str2</parameter>.
    </simpara>
    <para>
     The line of code:
     <informalexample>
      <programlisting role="php">
<![CDATA[
<?php
$var = strspn("42 is the answer, what is the question ...", "1234567890");
?>
]]>
      </programlisting>
     </informalexample>
     will assign 2 to <varname>$var</varname>, because the string "42" will
     be the longest segment containing characters from "1234567890".
    </para>
    <simpara>
     As of PHP 4.3.0, <function>strspn</function> accepts two optional 
     <type>integer</type> parameters that can be used to define the 
     <parameter>start</parameter> position and the 
     <parameter>length</parameter> of the string to examine.
    </simpara>
    <para>
     <informalexample>
      <programlisting role="php">
<![CDATA[
<?php
echo strspn("foo", "o", 1, 2); // 2
?>
]]>
      </programlisting>
     </informalexample>
    </para>

    &note.bin-safe;

    <simpara>
     See also <function>strcspn</function>.
    </simpara>
   </refsect1>
  </refentry>

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