Commonly used practical functions in PHP_PHP tutorial

1. For foreach, using $key=>$value and $i => $g have the same effect, and are not limited to key value

echo "
n";

$arr = array("one", "two", "three");

foreach ($arr as $i => $g) {

echo "Key: $i; Value: $g
n";

}

?>

2. array_fill () function

Fill the array with the given values

$a = array_fill(5, 6, 'banana');

print_r($a);

?>

Output:

Array ( [5] => banana [6] => banana [7] => banana [8] => banana [9] => banana [10] => banana )

3. Print array (PHP mode and JSON mode)

$data = array(

'firstname'=>'Tom',

'lastname'=>'Smith',

'age'=>40

);

print_r($data);

echo json_encode($data);

Output:

Array ( [firstname] => Tom [lastname] => Smith [age] => 40 )

{"firstname":"Tom","lastname":"Smith","age":40}

4. print_r($data,true); Only in this way can the array be written to the log www.2cto.com

$a = array ("a", "b", "c");
$c= print_r($a,true);

$logfile = "t.txt";

error_log("{$c}rnrn",3,$logfile);

Excerpted from Heda Li Xin’s Crazy Coding Life

http://www.bkjia.com/PHPjc/478354.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/478354.htmlTechArticle1. For foreach, $key=$value and $i = $g have the same effect, not only Limited to key value ?php echo br /n; $arr = array(one, two, three); foreach ($arr as $i = $g) { echo Key:...