php-doc-en/reference/strings/functions/strcspn.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id="function.strcspn">
   <refnamediv>
    <refname>strcspn</refname>
    <refpurpose>
     Find length of initial segment not matching mask
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>strcspn</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 does <emphasis>not</emphasis>
     contain any of the characters in <parameter>str2</parameter>.
    </simpara>
    <simpara>
     As of PHP 4.3.0, <function>strcspn</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>

    &note.bin-safe;

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

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