PHP用新字符串替换第一个字母 - wordpress标题

Question

我在做什么错了？

$title = get_the_title(); 
$firstLetter = $title[0]; 
$title[0] = '<span class = "wrapBlue">' . $firstLetter . '</span>';  

echo $title; // comes out with weird switched around string? 

get_the_title()是一个wordpress函数。

var_dump on $title给出长度的串21.

var_dump on $firstLetter给出包含长度为1

Answer 1

如你所知$title[0]指的是第一个字母 - 但你要分配的不是一封信。尝试是这样的：

$title = '<span class = "wrapBlue">' . $firstLetter . '</span>' . substr($title, 1); 

Answer 2

的正确的字符尝试这样的字符串：

$title = get_the_title(); 
$firstLetter = substr($title, 0, 1); 
$title .= '<span class = "wrapBlue">' . $firstLetter . '</span>' . substr($title, 1, strlen($title); 
echo $title; 

Oneliner：

echo '<span class = "wrapBlue">' . substr(get_the_title(), 0, 1) . '</span>' . substr(get_the_title(), 1, strlen(get_the_title());