- Listing of String Functions
- Using the String Functions
- Formatting Strings
- Converting to and from Strings
- Creating Arrays
- Modifying Arrays
- Removing Array Elements
- Looping Over Arrays
- Listing of the Array Functions
- Sorting Arrays
- Navigating through Arrays
- Imploding and Exploding Arrays
- Extracting Variables from Arrays
- Merging and Splitting Arrays
- Comparing Arrays
- Manipulating the Data in Arrays
- Creating Multidimensional Arrays
- Looping Over Multidimensional Arrays
- Using the Array Operators
- Summary
This chapter is from the book
This chapter is from the book
This chapter is from the book
Using the Array Operators
Want more array power? Check out the array operators:
|
$a + $b |
Union of $a and $b. |
|
$a == $b |
TRUE if $a and $b have the same elements. |
|
$a === $b |
TRUE if $a and $b have the same elements in the same order. |
|
$a != $b |
TRUE if $a is not equal to $b. |
|
$a <> $b |
TRUE if $a is not equal to $b. |
|
$a !== $b |
TRUE if $a is not identical to $b. |
Most of these have to do with comparing arrays, but the + operator is designed to concatenate arrays. You can see an example in phparrayops.php, Example 3-6, where we put to work not only the + operator but also the == operator, checking to see if two arrays have the same elements (in this case, they don't).
Example 3-6. Using array operators, phparrayops.php
<HTML>
<HEAD>
<TITLE>
Using array operators
</TITLE>
</HEAD>
<BODY>
<H1>
Using array operators
</H1>
<?php
$fruits["apples"] = 3839;
$fruits["oranges"] = 2289;
$vegetables["broccoli"] = 1991;
$vegetables["corn"] = 9195;
echo "\$fruits: ";
print_r($fruits);
echo "<BR>";
echo "\$vegetables: ";
print_r($vegetables);
echo "<BR>";
$produce = $fruits + $vegetables;
echo "\$produce: ";
print_r($produce);
echo "<BR>";
if ($fruits == $vegetables){
echo "\$fruits has the same elements as \$vegetables<BR>";
}
else {
echo "\$fruits does not have the same elements as
\$vegetables<BR>";
}
?>
</BODY>
</HTML>
The results appear in Figure 3-6, where you can see that the + operator did indeed concatenate the arrays we wanted it to, and the == operator did indeed compare the two arrays properly.
)
Figure 3-6 Using array operators.