PHP Array Operators: Manipulating Arrays in PHP
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The PHP array operators are used to compare arrays.
| Operator | Name | Example | Result |
|---|---|---|---|
| + | Union | $x + $y | Union of $x and $y |
| == | Equality | $x == $y | Returns true if $x and $y have the same key/value pairs |
| === | Identity | $x === $y | Returns true if $x and $y have the same key/value pairs in the same order and of the same types |
| != | Inequality | $x != $y | Returns true if $x is not equal to $y |
| <> | Inequality | $x <> $y | Returns true if $x is not equal to $y |
| !== | Non-identity | $x !== $y | Returns true if $x is not identical to $y |
Example: + Union
Union of $x and $y
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"a"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"red"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"b"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"green"</span><span class="pun">);</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"c"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"blue"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"d"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"yellow"</span><span class="pun">);</span><span class="pln"> print_r</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">+</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="com">// union of $x and $y</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
The above code will produce the following result-
<span class="pln"> </span><span class="typ">Array</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> </span><span class="pun">[</span><span class="pln">a</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> red </span><span class="pun">[</span><span class="pln">b</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> green </span><span class="pun">[</span><span class="pln">c</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> blue </span><span class="pun">[</span><span class="pln">d</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> yellow </span><span class="pun">)</span><span class="pln"> </span>
Example: == Equality
Returns true if $x and $y have the same key/value pairs
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"a"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"ram"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"b"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"shyam"</span><span class="pun">);</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"c"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"rama"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"d"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"shyma"</span><span class="pun">);</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">==</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
The above code will produce the following result-
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">false</span><span class="pun">)</span><span class="pln"> </span>
Example: === Identity
Returns true if $x and $y have the same key/value pairs in the same order and of the same types
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"a"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"ram"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"b"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"mohon"</span><span class="pun">);</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"c"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"rama"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"d"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"mohona"</span><span class="pun">);</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">===</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
The above code will produce the following result-
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">false</span><span class="pun">)</span><span class="pln"> </span>
Example: != Inequality
Returns true if $x is not equal to $y
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"a"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"red"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"b"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"green"</span><span class="pun">);</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"c"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"blue"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"d"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"yellow"</span><span class="pun">);</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">!=</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
The above code will produce the following result-
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
Example: <> Inequality
Returns true if $x is not equal to $y
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"a"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"red"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"b"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"green"</span><span class="pun">);</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"c"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"blue"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"d"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"yellow"</span><span class="pun">);</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun"><></span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
The above code will produce the following result-
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
Example: !== Non-identity
Returns true if $x is not identical to $y
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"a"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"red"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"b"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"green"</span><span class="pun">);</span><span class="pln"> $y </span><span class="pun">=</span><span class="pln"> array</span><span class="pun">(</span><span class="str">"c"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"blue"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"d"</span><span class="pln"> </span><span class="pun">=></span><span class="pln"> </span><span class="str">"yellow"</span><span class="pun">);</span><span class="pln"> var_dump</span><span class="pun">(</span><span class="pln">$x </span><span class="pun">!==</span><span class="pln"> $y</span><span class="pun">);</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
The above code will produce the following result-
<span class="pln"> </span><span class="kwd">bool</span><span class="pun">(</span><span class="kwd">true</span><span class="pun">)</span><span class="pln"> </span>
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