<?php
$string = "ZAN ROAD HOG HEADWRAPS The most popular ZAN headwrap style-features custom and original artwork";
echo preg_replace('~(?:[A-Z]+ )+\K~', '-- ', $string, 1);
echo "\n---\n";
echo preg_replace('~^(?:[A-Z]+ )+\K~', '-- ', $string); // without telling function to perform a single replacement
ZAN ROAD HOG HEADWRAPS -- The most popular ZAN headwrap style-features custom and original artwork
---
ZAN ROAD HOG HEADWRAPS -- The most popular ZAN headwrap style-features custom and original artwork
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
ZAN ROAD HOG HEADWRAPS -- The most popular ZAN headwrap style-features custom and original artwork
---
ZAN ROAD HOG HEADWRAPS -- The most popular ZAN headwrap style-features custom and original artwork