一、foreach()：foreach()是一个用来遍历数组中数据的最简单有效的方法。

$colors = array("red","green","blue","yellow");
foreach($colors as $value){
    echo "The color is $value <br>";
}
#输出内容
/**
The color is red
The color is green
The color is blue
The color is yellow
**/

二、for()：使用for语句循环遍历数组，数组必须是索引数组。

$colors = array("red","green","blue","yellow");
for($i=0; $i<count($colors); $i++){ 
    $value= $colors[$i]; 
    echo "The color is $value <br>";
}
#输出内容
/**
The color is red
The color is green
The color is blue
The color is yellow
**/

三、while()和list()，each()配合使用：

$colors = array("red","green","blue","yellow");
while(list($key,$value) = each($colors)){ 
    echo "The color is $value <br>";
}
#输出内容
/**
The color is red
The color is green
The color is blue
The color is yellow
**/