Programming PHP

echo "$key is $value\n";
}
0 is spam@cyberpromo.net
1 is abuse@example.com
This approach does not make a copy of the array, as foreach does. This is useful for
very large arrays when you want to conserve memory.
The iterator functions are useful when you need to consider some parts of the array
separately from others. Example 5-1 shows code that builds a table, treating the first
index and value in an associative array as table column headings.
Example 5-1. Building a table with the iterator functions
$ages = array('Person' => 'Age',
'Fred' => 35,
'Barney' => 30,
'Tigger' => 8,
'Pooh' => 40);
// start table and print heading
reset($ages);
list($c1, $c2) = each($ages);
echo("$c1$c2\n");
// print the rest of the values
while (list($c1,$c2) = each($ages)) {
echo("$c1$c2\n");
}
// end the table
echo("");
PersonAge
Fred35
Barney30
Tigger8
Pooh40
Using a for Loop
If you know that you are dealing with an indexed array, where the keys are consecutive
integers beginning at 0, you can use a for loop to count through the indexes.
The for loop operates on the array itself, not on a copy of the array, and processes
elements in key order regardless of their internal order.
Here’s how to print an array using for:
$addresses = array('spam@cyberpromo.net', 'abuse@example.com');
for($i = 0; $i < count($array); $i++) {
$value = $addresses[$i];
echo "$value\n";
}
spam@cyberpromo.net
abuse@example.com
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Traversing Arrays | 127