寒假觉得应该学点什么 ，既然决定了就去做吧
放假前就觉得php很好，那就来学一下
------------------------------------------------------------------------------------------------
<?php
$test = “PHP”;
$str = “I love $test”;
$str1 = ‘I love $test’;
echo $str; //
<?php
$test = “PHP”;
$str = “I love $test”;
$str1 = ‘I love $test’;
echo $str; // ?????I love PHP
echo $str1; //
I love PHP
echo $str1; // ?????I love $test
?>
上面展示了PHP里面单引号和双引号的区别