大虾们救命啊！！！
01.txt
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aaaaaa|bbbbbbbbbbbbb|cccccccccccccccccccc|ddddddd|
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现在我要把"bbbbbbbbbbbbb"改为"33333333333333"
我该怎么改呢？
test.php
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<?php
$fp=fopen("01.txt","r");
$str=fgets($fp);
fclose($fp);
$str=explode("|",$str);
$str[1]=33333;
$fp=fopen("01.txt","w");
for ($i=0;$i<4;$i++)
{
fputs($str[$i]);
}
fclose($fp);
?>