공유할 수 있는 매우 유용한 10가지 PHP 함수

$a = 0;   
function iterate() {   
global $a;   
if( $a < 10 )   
recur();   
echo $a . “, “;   
}   
function recur() {   
global $a;   
$a++;   
// how did I get here?   
echo “\n\n\n”;   
debug_print_backtrace();   
if( $a < 10 )   
iterate();   
}   
iterate();   
# OUTPUT:   
#0 recur() called at [C:\htdocs\php_stuff\index.php:8]   
#1 iterate() called at [C:\htdocs\php_stuff\index.php:25]   
#0 recur() called at [C:\htdocs\php_stuff\index.php:8]   
#1 iterate() called at [C:\htdocs\php_stuff\index.php:21]   
#2 recur() called at [C:\htdocs\php_stuff\index.php:8]   
#3 iterate() called at [C:\htdocs\php_stuff\index.php:25]   
#0 recur() called at [C:\htdocs\php_stuff\index.php:8]   
#1 iterate() called at [C:\htdocs\php_stuff\index.php:21]   
#2 recur() called at [C:\htdocs\php_stuff\index.php:8]   
#3 iterate() called at [C:\htdocs\php_stuff\index.php:21]   
#4 recur() called at [C:\htdocs\php_stuff\index.php:8]   
#5 iterate() called at [C:\htdocs\php_stuff\index.php:25]

$items = array(   
“100 apples”, “5 apples”, “110 apples”, “55 apples”   
);   
// normal sorting:   
sort($items);   
print_r($items);   
# Outputs:   
# Array   
# (   
# [0] => 100 apples   
# [1] => 110 apples   
# [2] => 5 apples   
# [3] => 55 apples   
# )   
natsort($items);   
print_r($items);   
# Outputs:   
# Array   
# (   
# [2] => 5 apples   
# [3] => 55 apples   
# [0] => 100 apples   
# [1] => 110 apples   
# )

$dictionary = array(   
“php”, “javascript”, “css”   
);   
$word = “japhp”;   
$best_match = $dictionary[0];   
$match_value = levenshtein($dictionary[0], $word);   
foreach($dictionary as $w) {   
$value = levenshtein($word, $w);   
if( $value < $match_value ) {   
$best_match = $w;   
$match_value = $value;   
}   
}   
echo “Did you mean the ‘$best_match’ category?”;

foreach (glob(“*.php”) as $file)   
echo “$file\n”;