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>array_keys</H1
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><P
>    (PHP 4 )</P
>array_keys&nbsp;--&nbsp;Return all the keys of an array</DIV
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><H2
>Description</H2
>array <B
CLASS="methodname"
>array_keys</B
> ( array input [, mixed search_value])<BR
></BR
><P
>&#13;     <B
CLASS="function"
>array_keys()</B
> returns the keys, numeric and
     string, from the <TT
CLASS="parameter"
><I
>input</I
></TT
> array.
    </P
><P
>&#13;     If the optional <TT
CLASS="parameter"
><I
>search_value</I
></TT
> is specified,
     then only the keys for that value are returned. Otherwise, all
     the keys from the <TT
CLASS="parameter"
><I
>input</I
></TT
> are returned.
    </P
><P
>&#13;     <TABLE
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><B
>Example 1. <B
CLASS="function"
>array_keys()</B
> example</B
></P
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CLASS="php"
>$array = array (0 =&#62; 100, "color" =&#62; "red");
print_r(array_keys ($array));

$array = array ("blue", "red", "green", "blue", "blue");
print_r(array_keys ($array, "blue"));

$array = array ("color" =&#62; array("blue", "red", "green"), "size" =&#62; array("small", "medium", "large"));
print_r(array_keys ($array));</PRE
></TD
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><P
>&#13;       The printout of the program above will be:
       <TABLE
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CLASS="screen"
>Array
(
    [0] =&#62; 0
    [1] =&#62; color
)
Array
(
    [0] =&#62; 0
    [1] =&#62; 3
    [2] =&#62; 4
)
Array
(
    [0] =&#62; color
    [1] =&#62; size
)</PRE
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>
      </P
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></TD
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>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      This function was added to PHP 4, below is an implementation for
      those still using PHP 3.
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><B
>Example 2. 
        Implementation of <B
CLASS="function"
>array_keys()</B
> for PHP 3
        users
       </B
></P
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><PRE
CLASS="php"
>function array_keys ($arr, $term="") {
    $t = array();
    while (list($k,$v) = each($arr)) {
        if ($term &#38;&#38; $v != $term) {
            continue;
        }
        $t[] = $k;
    }
    return $t;
}</PRE
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     </P
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><P
>&#13;     See also <A
HREF="function.array-values.html"
><B
CLASS="function"
>array_values()</B
></A
>.
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