相关疑难解决方法(0)

What is this?

This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.

Why is this?

It used to be hard to find questions about operators and other syntax tokens.¹
The main idea is to have links to existing questions on Stack Overflow, so it's easier for us to reference them, not to copy over content from …

在PHP 中使用Heredoc有什么好处,你能展示一个例子吗？

我真的不明白以下代码中<<<CSSs和CSS;s 的用途是什么:

$css_var =  <<<CSS
/*Techozoic {$tech['ver']}*/

/*Variable Styles*/
#page{
background:{$tech_content_bg_color} url({$tech['content_bg_image']}) {$tech_content_bg_repeat} top left;
}
#header{
background-color:{$tech_content_bg_color};
}
body{
font-family:{$tech['default_font']}, Sans-Serif;
font-size: {$tech['body_font_size']}px;
background:{$tech_bg_color} url({$tech['bg_image']}) {$tech_bg_repeat} top left;
}
.techozoic_font_size{
font-size: {$tech['body_font_size']}px;
}
.narrowcolumn .entry,.widecolumn .entry, .top {
font-family:{$tech['body_font']}, Sans-Serif;
}
{$tech_post_bg_color_classes}{
background-color:{$tech_post_bg_color};
border-top:1px {$tech_acc_color} solid;
}
.top{
border:none;
}
h1{
font-family:{$tech_h1_font}, Sans-Serif;
}
h2{
font-family:{$tech_h2_font}, Sans-Serif;
}
h3{
font-family:{$tech_h3_font}, Sans-Serif;
}
h4{
font-family:{$tech_h4_font}, Sans-Serif;
}
h5{
font-family:{$tech_h5_font}, Sans-Serif;
}
.blog_title{
font-family:{$tech_blog_title_font}, Sans-Serif;
}
.post_title{ …