php中for、foreach使用

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<?php 
$arr = ['你','好','你','吃','了','么'];

for ($x=0; $x < count($arr); $x++) {
  echo "内容是：$arr[$x] <br>";
} 
?>

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 for($z=1;$z<=9;$z++){
				for($j=1;$j<=$z;$j++){
					echo $z."*".$j. "=" .$z*$j;
					if($z == $j){
						echo "<br>";
					}
				}
			}

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function rideNum($i=1, $k=1){
    if($i >= 10 || $k >= 10){exit;}
    echo $i.'x'.$k.'='.$i*$k.'  ';
 
    # 外层与个数相同，换行并进行下一页
    if($i == $k){ 
        echo '<br/>';
        rideNum(1,$k+1);
    }
    # 个数未尽，继续+1， 本行继续输出
    rideNum($i+1, $k);
}
rideNum(1,1);

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$colors = array("red","green","blue","yellow"); 
foreach ($colors as $value) {
  echo "$value <br>";
}

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$arr = [[1,2,3],[2,3,4]];
foreach ($arr as $ke => $va) {
 var_dump($va);
}

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$people = array("Peter", "Joe", "Glenn", "Cleveland");
print_r (each($people));