PHP Function inside of ECHO statement

Question

I'm using this function below in Wordpress:

function wpstudio_doctype() {
  $content = '<!DOCTYPE html>' . "\n";
  $content .= '<html ' . language_attributes() . '>';
    echo apply_filters( 'wpstudio_doctype', $content );
}

Problem is that the function displays $content above the <!DOCTYPE html> tag, instead of adding the string inside of the HTML tag.

What am I doing wrong here?

John Conde · Accepted Answer · 2015-02-20 20:40:41Z

6

language_attributes() does not return the attributes, it echos them.

// last line of language_attributes()
echo apply_filters( 'language_attributes', $output );

This means it will be displayed before your string is assembled. You need to capture this value using output buffering and then append it to your string.

// Not sure if the output buffering conflicts with anything else in WordPress
function wpstudio_doctype() {
  ob_start();
  language_attributes();
  $language_attributes = ob_get_clean();

  $content = '<!DOCTYPE html>' . "\n";
  $content .= '<html ' . $language_attributes . '>';
    echo apply_filters( 'wpstudio_doctype', $content );
}

answered Feb 20, 2015 at 20:40

John Conde

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2 Comments

Rob Myrick Over a year ago

Hi John, thanks for the answer. I understand, but an example would help - would you be willing? Thanks either way and I will now be able to fix this.

Rob Myrick Over a year ago

Hi John, this already worked perfect - accepting answer here in a few minutes - thanks so much

sharkmountain · Accepted Answer · 2020-10-18 16:21:56Z

0

Instead of output buffering, just use get_language_attributes() inside an ECHO statement. In this specific case:

function wpstudio_doctype() {
  $content = '<!DOCTYPE html>' . "\n";
  $content .= '<html ' . get_language_attributes() . '>';
    echo apply_filters( 'wpstudio_doctype', $content );
}

answered Oct 18, 2020 at 16:21

sharkmountain

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