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>array_unique</H1
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NAME="AEN8213"
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><P
>    (PHP 4 &#62;= 4.0.1)</P
>array_unique&nbsp;--&nbsp;Removes duplicate values from an array</DIV
><DIV
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><H2
>Description</H2
>array <B
CLASS="methodname"
>array_unique</B
> ( array array)<BR
></BR
><P
>&#13;     <B
CLASS="function"
>array_unique()</B
> takes input
     <TT
CLASS="parameter"
><I
>array</I
></TT
> and returns a new array
     without duplicate values.
    </P
><P
>&#13;     Note that keys are preserved. <B
CLASS="function"
>array_unique()</B
> sorts
     the values treated as string at first, then will keep the first key
     encountered for every value, and ignore all following keys. It does not
     mean that the key of the first related value from the unsorted
     <TT
CLASS="parameter"
><I
>array</I
></TT
> will be kept.
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      Two elements are considered equal if and only if
      <TT
CLASS="literal"
>(string) $elem1 === (string) $elem2</TT
>. In words:
      when the string representation is the same.
      
     </P
><P
>&#13;      The first element will be used.
     </P
></BLOCKQUOTE
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></TD
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><P
>&#13;      This was broken in PHP 4.0.4!
      
     </P
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><B
>Example 1. <B
CLASS="function"
>array_unique()</B
> example</B
></P
><TABLE
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><PRE
CLASS="php"
>$input = array ("a" =&#62; "green", "red", "b" =&#62; "green", "blue", "red");
$result = array_unique ($input);
print_r($result);</PRE
></TD
></TR
></TABLE
><P
>&#13;       This will output:
       <TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>Array
(
    [b] =&#62; green
    [1] =&#62; blue
    [2] =&#62; red
)</PRE
></TD
></TR
></TABLE
>
      </P
></DIV
></TD
></TR
></TABLE
>
    </P
><P
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><TD
><DIV
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><A
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></A
><P
><B
>Example 2. <B
CLASS="function"
>array_unique()</B
> and types</B
></P
><TABLE
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><TR
><TD
><PRE
CLASS="php"
>$input = array (4,"4","3",4,3,"3");
$result = array_unique ($input);
var_dump($result);</PRE
></TD
></TR
></TABLE
><P
>&#13;       The printout of the program above will be (PHP 4.0.6):
       <TABLE
BORDER="0"
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CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>array(2) {
  [3]=&#62;
  int(4)
  [4]=&#62;
  int(3)
}</PRE
></TD
></TR
></TABLE
>
      </P
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