CF7 get placeholder text from php - php

Question

When using CF7 (Contact Form 7) is there any way to get the placeholder text from a php function?
I’ve tried using a shortcode to call the php function, but it doesn’t work.
Here is my test:
function.php code:
add_filter( 'wpcf7_form_elements', 'do_shortcode' );
add_shortcode( 'get_placeholder', 'get_placeholder_func' );
function get_placeholder_func () {
return "Hello world";
}
CF7 template:
[get_placeholder]
[text the-field placeholder [get_placeholder]]
First line works fine and outputs the text returned from the php function.
Second line doesn't work as it only outputs a end-bracket.
I know I can do it by using js/jQuery, but it is a bit messy.
Can anybody help? Thanks :)

Answer 1

I'm a little unclear as to why you would want to do this, but here's a method.
add_filter( 'wpcf7_form_elements', 'cf7_replace_a_string' );
function cf7_replace_a_string( $content ) {
// Name = Form Tag Name.
$str_pos = strpos( $content, 'name="the-field"' );
// If your form field is present.
if ( false !== $str_pos ) {
$placeholder = 'this is your placeholder';
$content = str_replace( 'placeholder="placeholder"', 'placeholder="' . $placeholder . '"', $content );
}
return $content;
}
Then your form tag would look like this:
[text the-field placeholder "placeholder"]

Answer 2

Why don't you try the following:
Define the function
function get_placeholder_func () {
return "Hello world";
}
Then create your own input for CF7
wpcf7_add_form_tag('custom_text_input', 'wpcf7_custom_text_input');
function wpcf7_custom_text_input($tag) {
if (!is_array($tag)) return '';
$name = $tag['name'];
if (empty($name)) return '';
$placeholder = get_placeholder_func();
$html = '<input type="text" name="'.$name.'" placeholder="'.$placeholder.'" />';
return $html;
}
Then, when editing CF7 you just have to call the input created
[custom_text_input name-of-input]
This shortcode will have name-of-input name and placeholder declared by the function get_placeholder_func()
Hope it works.