打印

您’我可能在您的文件中看到了如下代码：

打印('%s World', $var );

This code includes a function named 打印() which in most cases is more efficient than using the 回声 要么 打印 functions.

要了解有关在WordPress中使用PHP代码的更多信息& Genesis, you’ll need to understand how the 打印 function works.

影片指南

快来了！

Printf generally includes a % percentage sign with an s for string like this:

%s

Printf can be used in replace of 打印 要么 回声 so rather than use this:

回声 "Hello World";

要么

打印( 'Hello World' );

相反，您可以像这样使用printf：

打印('%s World', "Hello" );

These % percentage signs with a s work like placeholders which are converted when the code is executed. In the above case %s is replaced with the text Hello.

这里’您可以在子主题函数文件中测试的完整工作代码：

add_action('loop_start','printf_example1' );
function printf_example1() {<br />
    printf('%s World', 'Hello' ); 
}

您 can then replace your text ‘Hello’ with a 变量 so the value for your $text 变量 is now equal to Hello:

$text = 'Hello';

您可以在子主题功能文件中测试的完整工作代码如下：

add_action('loop_start','printf_example2');
function printf_example2() {<br />
    $text = 'Hello';
    printf('%s World', $text ); 
}

在WordPress主题中，您’ll find code which uses 打印 which you can paste into your child themes functions.php file to see how it works:

add_action('loop_start','printf_example3');
function printf_example3() {<br />
printf( '<a href="%s">' . esc_html__( 'Your link text here', 'text-domain' ) . '</a>', 'http://example.com' ) ); 
}

The code above uses 打印 with one instance of %s which is replaced by the URL http://example.com when the function is executed.

上面的代码也可以这样写：

add_action('loop_start','printf_example4');
function printf_example4() {

<pre><code>$link = esc_url( get_permalink() );
$text = "Value for Your Text Variable";

printf( '&lt;a href="%s"&gt;%s&lt;/a&gt;', $link, $text ); 
</code></pre>

}

In this case, we have replaced the URL with a variable named $link. We have also replaced the text with a variable named $text.

The value for the $link 变量 is equal to the posts permalink rather than the example.com URL and the value for the $text 变量 is equal to the text.

您’ll还注意到字符串中的每个参数都用逗号分隔，如下所示：

$link, $text

When the code executes, the 1st placeholder %s is replaced with the 1st parameter which in this case is the $link 变量 which equals get_permalink();

替换完第一个占位符后，将按照它们在字符串中出现的顺序（由逗号分隔）逐步替换第二个，第三个等。

您 can also write the code as follows:

add_action('loop_start','printf_example5');
function printf_example5() {

<pre><code>$text = "Value for Your Text Variable";

printf( '&lt;a href="%s"&gt;%s&lt;/a&gt;', esc_url( get_permalink() ), $text ); 
</code></pre>

}

This way the 1st parameter is equal to the get_permalink function rather than the value for the $link 变量 as in example 4.

打印& sprintf

Printf 用于输出格式化的字符串。例：

add_action('loop_start','printf_example6' );
function printf_example6() {<br />
    printf('%s World', 'Hello' ); 
}

斯普林特 is returned as the value for a variable to be used later then the variable can be output using 回声 要么 打印. Example:

add_action('loop_start','printf_example7' );
function printf_example7() {<br />
   $output = sprintf('%s World', 'Hello' ); 
   echo $output;
}

问问题

会员 can ask questions & get answers.

相关的PHP代码

• 冲刺
• 使用printf&WordPress中的sprintf – 12个代码示例
• 什么是变量？