1.Foreach format
foreach (array_expression as $value) statement foreach (array_expression as $key => $value) statement
2.Foreach traversal of the array
a. Method 1 :
<?php
$arr = array(1, 2, 3, 4,7,8,9,10,11);
foreach($arr as $a)
{
echo $a,'<br/>';//1 2 3 4 5 6 7 8 9 10 11
}
?>b. Method 2:
<?php
$arr = array(1, 2, 3, 4,7,8,9,10,11);
foreach($arr as $a => $v)
{
echo 'key',$a,'== value',$v,'<br/>';
}
// key0== value1
// key1== value2
// key2== value3
// key3== value4
// key4== value7
// key5== value8
// key6== value9
// key7== value10
// key8== value11
?> 3.foreach traverses the object
Traverses the object , in fact, it means to take out and access all attributes (public attributes) in the object in the form of key-value pairs .
//定义类
class Man{
public $name = 'LiLei';
public $height = 178;
public $weight = 140;
protected $age = 30;
private $money = 1000;
}
//实例化
$m = new Man();
//遍历
foreach($m as $k => $v){
echo $k . ' : ' . $v . '<br/>'; //$k为属性名，$v为属性值
}
/* name : LiLei
height : 178
weight : 140
*/Recommended: php video tutorial php tutorial
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