Question

PHP用for循环遍历数组，如何能把数组中所有的2变成红色?代码如下: $a = array(1,

PHP用for循环遍历数组，如何能把数组中所有的2变成红色?代码如下:
$a = array(1,2,3,2,4,5,2,3,2,3,4,1,2,3,4,2,3,4,8,2,3,8,7,4,6,1,2,4,1,2,3,4,8,7,1,6,2,3,9,4,8,1,2,3,4,9,1,8,2,3,4,9,8,1,2,6,3,4,1,2,3,4,1);
$c=count($a);

for($i=0;$i<$c;$i++){
echo $a[$i];
}

Answer 1

<?php	
$a = array(1,2,3,2,4,5,2,3,2,3,4,1,2,3,4,2,3,4,8,2,3,8,7,4,6,1,2,4,1,2,3,4,8,7,1,6,2,3,9,4,8,1,2,3,4,9,1,8,2,3,4,9,8,1,2,6,3,4,1,2,3,4,1);

for($i=0;$i<count($a);$i++){	
if($a[$i]==2){
	echo "<span style='color:red'>".$a[$i].",</span>";
}else{
	echo "<span>".$a[$i].",</span>";
}
}
?>

给他加一个标签，然后设置color颜色就可以了，结果如下：

操作数据推荐用：foreach();

<?php	
$a = array(1,2,3,2,4,5,2,3,2,3,4,1,2,3,4,2,3,4,8,2,3,8,7,4,6,1,2,4,1,2,3,4,8,7,1,6,2,3,9,4,8,1,2,3,4,9,1,8,2,3,4,9,8,1,2,6,3,4,1,2,3,4,1);


foreach($a as $k){	
	if($k==2){
		echo "<span style='color:red'>".$k.",</span>";
	}else{
		echo "<span>".$k.",</span>";
	}
}
?>

Answer 2

for($i=0;$i<$c;$i++){
    if($a[$i] == 2){
        echo '<span style="color:red;">'.$a[$i].'</span>';
    }else{
        echo $a[$i];
    }
}