PHP标记
如果文件内容是纯PHP代码,最好在文件末尾删除PHP结束标记。这可以避免在PHP结束标记之后万一意外加入了空格或者换行符,会导致PHP开始输出这些空白,而脚本中此时并无输出的意图。当然PHP开始标记
使用条件的高级分离术
下面这段代码的意思很容易理解,关键是if-else的用法,这样使用在文本输出是显的逻辑更加清晰。
<?php $expression = false; ?><?php if ($expression == true): ?>This will show if the expression is true.<?php else: ?>Otherwise this will show.<?php endif; ?>
指令分隔符
PHP需要在每个语句后用分号结束指令,这个分号就叫指令分隔符。在一个PHP代码段中的最后一行可以不用分号结束。
注释
PHP支持C,C++和Unix Shell风格(Perl 风格)的注释,也就是/**/、//、#。
单行注释仅仅注释到行末或者当前的PHP代码块,这意味着在// ... ?>或者# ... ?>之后的HTML代码将被显示出来。不过,标记在单行注释中不会跳出PHP模式。
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