array-all.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.array-all" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_all</refname>
  <refpurpose>Checks if all &array; elements satisfy a callback function</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>array_all</methodname>
   <methodparam><type>array</type><parameter>array</parameter></methodparam>
   <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
  </methodsynopsis>
  <simpara>
   <function>array_all</function> returns &true;, if the given
   <parameter>callback</parameter> returns &true; for all elements.
   Otherwise the function returns &false;.
  </simpara>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>array</parameter></term>
    <listitem>
     <simpara>
      The &array; that should be searched.
     </simpara>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>callback</parameter></term>
    <listitem>
     <para>
      The callback function to call to check each element, which must be
      <methodsynopsis>
       <type>bool</type><methodname><replaceable>callback</replaceable></methodname>
       <methodparam><type>mixed</type><parameter>value</parameter></methodparam>
       <methodparam><type>mixed</type><parameter>key</parameter></methodparam>
      </methodsynopsis>
      If this function returns &false;, &false; is returned from
      <function>array_all</function> and the callback will not be called for
      further elements.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <simpara>
   The function returns &true;, if <parameter>callback</parameter> returns
   &true; for all elements. Otherwise the function returns &false;.
  </simpara>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title><function>array_all</function> example</title>
   <programlisting role="php">
<![CDATA[
<?php
$array = [
    'a' => 'dog',
    'b' => 'cat',
    'c' => 'cow',
    'd' => 'duck',
    'e' => 'goose',
    'f' => 'elephant'
];

// Check, if all animal names are shorter than 12 letters.
var_dump(array_all($array, function (string $value) {
    return strlen($value) < 12;
}));

// Check, if all animal names are longer than 5 letters.
var_dump(array_all($array, function (string $value) {
    return strlen($value) > 5;
}));

// Check, if all array keys are strings.
var_dump(array_all($array, function (string $value, $key) {
   return is_string($key);
}));
?>
]]>
   </programlisting>
   &example.outputs;
   <screen>
<![CDATA[
bool(true)
bool(false)
bool(true)
]]>
   </screen>
  </example>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>array_any</function></member>
   <member><function>array_filter</function></member>
   <member><function>array_find</function></member>
   <member><function>array_find_key</function></member>
  </simplelist>
 </refsect1>
</refentry>
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