用PHP修剪领先的空格? [英] Trim leading white space with PHP?
问题描述
Wordpress PHP函数中似乎存在一个错误，使得空格留在了<?php echo wp_title(''); ?>生成的页面标题的前面.我在该函数上浏览过Wordpress文档和论坛，没有任何运气.
There seems to be a bug in a Wordpress PHP function that leaves whitespace in front of the title of the page generated by <?php echo wp_title(''); ?> I've been through the Wordpress docs and forums on that function without any luck.
我正以这种方式使用它<body id="<?php echo wp_title(''); ?>">，以生成带有页面标题ID的HTML正文标签.
I'm using it this way <body id="<?php echo wp_title(''); ?>"> in order to generate an HTML body tag with the id of the page title.
所以我需要做的是去掉该空白，以便body标签看起来像这样的<body id="mypage">而不是这个<body id=" mypage">
So what I need to do is strip that white space, so that the body tag looks like this <body id="mypage"> instead of this <body id=" mypage">
多余的空格会杀死我要用来突出显示活动页面菜单项的CSS.当我手动添加正确的body标签而没有空格时，我的CSS起作用了.
The extra white space kills the CSS I'm trying to use to highlight menu items of the active page. When I manually add a correct body tag without the white space, my CSS works.
那么我将如何去除空白?谢谢，马克
So how would I strip the white space? Thanks, Mark
史诗第二部分
约翰，十六进制转储是个好主意.它显示空白为两个"20"空格.但是所有去除前导空格和空白的解决方案都没有.
John, A hex dump was a good idea; it shows the white space as two "20" spaces. But all solutions that strip leading spaces and white space didn't.
然后，<?php ob_start(); $title = wp_title(''); ob_end_clean(); echo $title; ?>
给我< body id ="">
和<?php ob_start(); $title = wp_title(''); echo $title; ?>
给我< body id =" mypage">
拼图.问题的根源在于wp_title具有可选的页面标题前导字符-看起来像人字形-如果该选项为false则应该将其删除，但实际上是空白，但转储了空白.
Puzzle. The root of the problem is that wp_title has optional page title leading characters - that look like chevrons - that are supposed to be dropped when the option is false, and they are, but white space gets dumped in.
有核选择吗?
是的，之前都尝试过它们；他们仍然返回两个前导空格... arrgg
Yup, tried them both before; they still return two leading spaces... arrgg
推荐答案
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从标题的左端剥离所有空格:
Strip all whitespace from the left end of the title:
<?php echo ltrim(wp_title('')); ?>
从两端剥离所有空格:
Strip all whitespace from either end:
<?php echo trim(wp_title('')); ?>
在标题的左端去除所有空格:
Strip all spaces from the left end of the title:
<?php echo ltrim(wp_title(''), ' '); ?>
删除第一个空格，即使它不是第一个字符:
Remove the first space, even if it's not the first character:
<?php echo str_replace(' ', '', wp_title(''), 1); ?>
在开头仅带一个空格(不是换行符，不是制表符):
Strip only a single space (not newline, not tab) at the beginning:
<?php echo preg_replace('/^ /', '', wp_title('')); ?>
剥离第一个字符，不管它是什么:
Strip the first character, whatever it is:
<?php echo substr(wp_title(''), 1); ?>
更新
在wp_title 上的Wordpress 文档中，看来wp_title显示了标题本身，除非您为第二个参数传递false，在这种情况下它将返回它.因此，尝试:
Update
From the Wordpress documentation on wp_title, it appears that wp_title displays the title itself unless you pass false for the second parameter, in which case it returns it. So try:
<?php echo trim(wp_title('', false)); ?>
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