Question

How to use array operators in PHP

Answer 1

$a1 = array("a" => "aaa", "b" => "bbb", "c" => "ccc");
$a2 = array("d" => "ddd", "e" => "eee", "f" => "fff");
print_r($a1 + $a2); // Union of $a1 and $a2
echo "<br />";


$a1 = array("a", "b");
$a2 = array("a", "b");
var_dump($a1 == $a2); // True if $a1 and $a2 have the same value
echo "<br />";
if ($a1 == $a2)
    echo "true";  // true
else
    echo "false";
echo "<br />";

 
$a1 = array("a", "b");
$a2 = array("a", "b");
var_dump($a1 === $a2); // true if $a1 and $a2 have the same value and the same types
echo "<br />";
if ($a1 === $a2)
    echo "true"; // true
else
    echo "false";
echo "<br />";    


$a1 = array("a", "b");
$a2 = array(1 => "a", 2 => "b");
var_dump($a1 === $a2); // bool(false) 
echo "<br />";  
if ($a1 === $a2)
    echo "true"; 
else
    echo "false"; // false
echo "<br />";  
 
 
$a1 = array("a", "b");
$a2 = array("a", "c"); 
var_dump($a1 != $a2); // true if $a1 is not equal to $a2
echo "<br />";  
if ($a1 != $a2)
    echo "true"; // true
else
    echo "false"; 
echo "<br />"; 


$a1 = array("a", "b");
$a2 = array(1 => "a", 2 => "b"); 
var_dump($a1 !== $a2); // true if $a1 is not identical to $a2
echo "<br />";  
if ($a1 !== $a2)
    echo "true"; // true
else
    echo "false"; 
echo "<br />"; 
 
/*
run:

Array ( [a] => aaa [b] => bbb [c] => ccc [d] => ddd [e] => eee [f] => fff ) 
bool(true) 
true
bool(true) 
true
bool(false) 
false
bool(true) 
true
bool(true) 
true

*/

 

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