问个变量的简单问题?

[95306]

print "Hello $arr['fruit']";
print "Hello ".$arr['fruit'];
究竟连接符.什么时候用,什么时候不用

[keaizhong]

第一个是在引号里的，
第二个是在引号外的。
引号外的连接字符都要用这个连接符

[lawyu]

如果在字符串里变量名和后面的字符串不能区分就用连接符，下面的第二个就必须用.或{}否则$beer和s连在一起没法儿区别
<?php
$beer = 'Heineken';
echo "$beer's taste is great"; // works, "'" is an invalid character for varnames
echo "He drank some $beers"; // won't work, 's' is a valid character for varnames
echo "He drank some ${beer}s"; // works
echo "He drank some {$beer}s"; // works
?>

建议直接用{}在字符串里把变量扩起来"Hello {$arr['fruit']}";

[xuzuning]

个人喜好
print "Hello $arr[fruit]";
print "Hello ".$arr['fruit'];
前者显得简洁些，尤其是字符与变量交错较多时。但也容易出错