PHP Warning: ltrim() Problem in WordPress (formatting.php) - php

Question

I am writing this in shell;
sudo tail -100 /var/log/apache2/error.log
And, I saw this;
......
[Sun Feb 14 09:42:06.873076 2021] [php7:warn] [pid 1968] [client 82.222.237.83:36955] PHP Warning: ltrim() expects parameter 1 to be string, object given in /var/www/html/wp-includes/formatting.php on line 4314
[Sun Feb 14 09:42:06.873149 2021] [php7:warn] [pid 1968] [client 82.222.237.83:36955] PHP Warning: ltrim() expects parameter 1 to be string, object given in /var/www/html/wp-includes/formatting.php on line 4314
...
I'm going to the relevant code. --> /var/www/html/wp-includes/formatting.php on line 4314
function esc_url( $url, $protocols = null, $_context = 'display' ) {
$original_url = $url;
if ( '' === $url ) {
return $url;
}
$url = str_replace( ' ', '%20', ltrim( $url ) );
$url = preg_replace( '|[^a-z0-9-~+_.?#=!&;,/:%#$\|*\'()\[\]\\x80-\\xff]|i', '', $url );
if ( '' === $url ) {
return $url;
}
if ( 0 !== stripos( $url, 'mailto:' ) ) {
$strip = array( '%0d', '%0a', '%0D', '%0A' );
$url = _deep_replace( $strip, $url );
}
$url = str_replace( ';//', '://', $url );
on line 4314;
$url = str_replace( ' ', '%20', ltrim( $url ) );
I did not understand. My error page is full of this. I could not figure out despite my research. Can you help me?
Note: Ubuntu 20.04, Wordpress
Healthy days,
Best regards.

Answer 1

The function esc_url() is called with a $url that is object rather a string. You can use gettype() or print_r() to confirm. debug_backtrace() might be useful to figure out where you are making those calls from.