PHP中关于双引号和单引号的有关问题

PHP中关于双引号和单引号的问题

PHP code

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$this->view->baseUrl = $this->_request->getBaseUrl();
echo '<a href="'.%24this->view->baseUrl.'/index/index/">返回</a>';
echo "<a href="%24this-">view->baseUrl/index/index/>返回</a>";

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PHP code

<?php class foo
{
    public $a;
    
    function __construct(){
        $this->a='aaaaaaaaaaaaa';
    }
}

$f=new foo();

echo "BBB{$f->a}BBBBB";

?> <div class="clear">
                 
              
              
        
            </div>

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