PHP常用实用函数_PHP教程

1. 对于foreach其实 用$key=>$value和$i => $g 是效果一样的，并不仅限于key value

echo "
\n";

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

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

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

}

?>

2. array_fill ()函数

用给定的值填充数组

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

print_r($a);

?>

输出：

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

3. 打印数组（PHP模式和JSON模式）

$data = array(

'firstname'=>'Tom',

'lastname'=>'Smith',

'age'=>40

);

print_r($data);

echo json_encode($data);

输出：

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

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

4. print_r($data,true);这样才可以把数组写到日志里www.2cto.com

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

$logfile = "t.txt";

error_log("{$c}\r\n\r\n",3,$logfile);

摘自 河大李信的 Crazy Coding人生

http://www.bkjia.com/PHPjc/478354.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/478354.htmlTechArticle1. 对于foreach其实 用$key=$value和$i = $g 是效果一样的，并不仅限于key value ?php echo br /\n; $arr = array(one, two, three); foreach ($arr as $i = $g) { echo Key:...