в 10:37, 26 мая 2010

2010-05-26T10:37:25Z

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2010-05-26T07:02:46Z

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==Apply a user function to every member of an array.==



<source lang="html4strict">

<?
$fruits = array ("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
function test_alter (&$item1, $key, $prefix) {
$item1 = "$prefix: $item1";
}
function test_print ($item2, $key) {
echo "$key. $item2<br>\n";
}
array_walk ($fruits, "test_print");
reset ($fruits);
array_walk ($fruits, "test_alter", "fruit");
reset ($fruits);
array_walk ($fruits, "test_print");
?>

</source>

==Applying Functions to Array Elements Using array_walk()==



<source lang="html4strict">

<?php
function array_display($array, $pre=FALSE)
{
$tag = $pre ? "pre" : "p";
printf("<%s>%s</%s>\n", $tag, var_export($array, TRUE), $tag);
}
function modify(&$element)
{
$element *= 1.5;
}
$array = array(10, -3.5, 2, 7);
array_display($array, TRUE);
array_walk($array, "modify");
array_display($array, TRUE);
?>

</source>

==array_walk() function applies a function to several or all elements in an array.==



<source lang="html4strict">

Its syntax is: int array_walk(array array, string func_name, [mixed data])

<?
//Using array_walk() to delete duplicates in an array:
function delete_dupes($element) {
static $last="";
if ($element == $last)
unset($element);
else
$last=$element;
}

$emails = array("b@b.ru", "c@w.ru", "b@b.ru");

sort($emails);
print_r($emails);
echo "<br>";
reset($emails);
print_r($emails);
echo "<br>";
array_walk($emails,"delete_dupes");
print_r($emails);
echo "<br>";

?>

</source>

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в 10:37, 26 мая 2010

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