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php-manual-ar-5.1.6-1mdv2008.1.noarch.rpm

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>Hoofdstuk 10. Operators</TD
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><A
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>Array Operators</A
></H1
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><A
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><P
><B
>Tabel 10-7. Array Operators</B
></P
><TABLE
BORDER="1"
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><COL><COL><COL><THEAD
><TR
><TH
>Example</TH
><TH
>Name</TH
><TH
>Result</TH
></TR
></THEAD
><TBODY
><TR
><TD
>$a + $b</TD
><TD
>Union</TD
><TD
>Union of $a and $b.</TD
></TR
><TR
><TD
>$a == $b</TD
><TD
>Equality</TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a and $b have the same elements.</TD
></TR
><TR
><TD
>$a === $b</TD
><TD
>Identity</TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a and $b have the same elements in the same order.</TD
></TR
><TR
><TD
>$a != $b</TD
><TD
>Inequality</TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a is not equal to $b.</TD
></TR
><TR
><TD
>$a &#60;&#62; $b</TD
><TD
>Inequality</TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a is not equal to $b.</TD
></TR
><TR
><TD
>$a !== $b</TD
><TD
>Non-identity</TD
><TD
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a is not identical to $b.</TD
></TR
></TBODY
></TABLE
></DIV
><P
>&#13;    The <VAR
CLASS="literal"
>+</VAR
> operator
    appends the right handed array to the left handed, whereas 
    duplicated keys are NOT overwritten.
   </P
><P
>&#13;    <DIV
CLASS="informalexample"
><P
></P
><A
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$a </font><font color="#007700">= array(</font><font color="#DD0000">"a" </font><font color="#007700">=&gt; </font><font color="#DD0000">"apple"</font><font color="#007700">, </font><font color="#DD0000">"b" </font><font color="#007700">=&gt; </font><font color="#DD0000">"banana"</font><font color="#007700">);<br /></font><font color="#0000BB">$b </font><font color="#007700">= array(</font><font color="#DD0000">"a" </font><font color="#007700">=&gt; </font><font color="#DD0000">"pear"</font><font color="#007700">, </font><font color="#DD0000">"b" </font><font color="#007700">=&gt; </font><font color="#DD0000">"strawberry"</font><font color="#007700">, </font><font color="#DD0000">"c" </font><font color="#007700">=&gt; </font><font color="#DD0000">"cherry"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$c </font><font color="#007700">= </font><font color="#0000BB">$a </font><font color="#007700">+ </font><font color="#0000BB">$b</font><font color="#007700">; </font><font color="#FF8000">// Union of $a and $b<br /></font><font color="#007700">echo </font><font color="#DD0000">"Union of \$a and \$b: \n"</font><font color="#007700">;<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$c</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$c </font><font color="#007700">= </font><font color="#0000BB">$b </font><font color="#007700">+ </font><font color="#0000BB">$a</font><font color="#007700">; </font><font color="#FF8000">// Union of $b and $a<br /></font><font color="#007700">echo </font><font color="#DD0000">"Union of \$b and \$a: \n"</font><font color="#007700">;<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$c</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
    When executed, this script will print the following:
    <TABLE
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><TD
><code><font color="#000000">
Union of $a and $b:<br />array(3) {<br />&nbsp;&nbsp;["a"]=&gt;<br />&nbsp;&nbsp;string(5) "apple"<br />&nbsp;&nbsp;["b"]=&gt;<br />&nbsp;&nbsp;string(6) "banana"<br />&nbsp;&nbsp;["c"]=&gt;<br />&nbsp;&nbsp;string(6) "cherry"<br />}<br />Union of $b and $a:<br />array(3) {<br />&nbsp;&nbsp;["a"]=&gt;<br />&nbsp;&nbsp;string(4) "pear"<br />&nbsp;&nbsp;["b"]=&gt;<br />&nbsp;&nbsp;string(10) "strawberry"<br />&nbsp;&nbsp;["c"]=&gt;<br />&nbsp;&nbsp;string(6) "cherry"<br />}</font>
</code></TD
></TR
></TABLE
>
   </P
><P
>&#13;    Elements of arrays are equal for the comparison if they have the
    same key and value.
   </P
><P
>&#13;    <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN4004"
></A
><P
><B
>Voorbeeld 10-3. Comparing arrays</B
></P
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BORDER="0"
BGCOLOR="#E0E0E0"
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><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$a </font><font color="#007700">= array(</font><font color="#DD0000">"apple"</font><font color="#007700">, </font><font color="#DD0000">"banana"</font><font color="#007700">);<br /></font><font color="#0000BB">$b </font><font color="#007700">= array(</font><font color="#0000BB">1 </font><font color="#007700">=&gt; </font><font color="#DD0000">"banana"</font><font color="#007700">, </font><font color="#DD0000">"0" </font><font color="#007700">=&gt; </font><font color="#DD0000">"apple"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$a </font><font color="#007700">== </font><font color="#0000BB">$b</font><font color="#007700">); </font><font color="#FF8000">// bool(true)<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$a </font><font color="#007700">=== </font><font color="#0000BB">$b</font><font color="#007700">); </font><font color="#FF8000">// bool(false)<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
   </P
><P
>&#13;    See also the manual sections on the 
    <A
HREF="language.types.array.html"
>Array type</A
> and 
    <A
HREF="ref.array.html"
>Array functions</A
>.
   </P
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