diff --git a/admin/renderer.php b/admin/renderer.php
index 5abd08eaebb..daaf68466b1 100644
--- a/admin/renderer.php
+++ b/admin/renderer.php
@@ -1285,7 +1285,7 @@ class core_admin_renderer extends plugin_renderer_base {
         if ($unavailable or $unknown) {
             $out .= $this->output->heading(get_string('misdepsunavail', 'core_plugin'));
             if ($unknown) {
-                $out .= $this->output->notification(get_string('misdepsunknownlist', 'core_plugin', implode($unknown, ', ')));
+                $out .= $this->output->notification(get_string('misdepsunknownlist', 'core_plugin', implode(', ', $unknown)));
             }
             if ($unavailable) {
                 $unavailablelist = array();
@@ -1300,7 +1300,7 @@ class core_admin_renderer extends plugin_renderer_base {
                     $unavailablelist[] = $unavailablelistitem;
                 }
                 $out .= $this->output->notification(get_string('misdepsunavaillist', 'core_plugin',
-                    implode($unavailablelist, ', ')));
+                    implode(', ', $unavailablelist)));
             }
             $out .= $this->output->container_start('plugins-check-dependencies-actions');
             $out .= ' '.html_writer::link(new moodle_url('/admin/tool/installaddon/'),
@@ -1420,7 +1420,7 @@ class core_admin_renderer extends plugin_renderer_base {
                 html_writer::div($plugin->name, 'name').' '.html_writer::div($plugin->component, 'component'),
                 $plugin->version->release,
                 $plugin->version->version,
-                implode($supportedmoodles, ' '),
+                implode(' ', $supportedmoodles),
                 $info
             );
         }
@@ -2011,7 +2011,7 @@ class core_admin_renderer extends plugin_renderer_base {
                 if (empty($CFG->docroot) or $environment_result->plugin) {
                     $report = get_string($stringtouse, 'admin', $rec);
                 } else {
-                    $report = $this->doc_link(join($linkparts, '/'), get_string($stringtouse, 'admin', $rec), true);
+                    $report = $this->doc_link(join('/', $linkparts), get_string($stringtouse, 'admin', $rec), true);
                 }
                 // Enclose report text in div so feedback text will be displayed underneath it.
                 $report = html_writer::div($report);
diff --git a/completion/criteria/completion_criteria_activity.php b/completion/criteria/completion_criteria_activity.php
index 592c84e8a57..3e43ef1e5c6 100644
--- a/completion/criteria/completion_criteria_activity.php
+++ b/completion/criteria/completion_criteria_activity.php
@@ -288,7 +288,7 @@ class completion_criteria_activity extends completion_criteria {
             }
         }
 
-        $details['requirement'] = implode($details['requirement'], ', ');
+        $details['requirement'] = implode(', ', $details['requirement']);
 
         $details['status'] = '';
 
diff --git a/filter/tex/filter.php b/filter/tex/filter.php
index 924837fc499..395638d22b7 100644
--- a/filter/tex/filter.php
+++ b/filter/tex/filter.php
@@ -160,7 +160,7 @@ class filter_tex extends moodle_text_filter {
             '\\\\\((.+?)\\\\\)',
             '\\[tex\\](.+?)\\[\/tex\\]'
         );
-        $megarule = '/' . implode($rules, '|') . '/is';
+        $megarule = '/' . implode('|', $rules) . '/is';
         preg_match_all($megarule, $text, $matches);
         for ($i=0; $i<count($matches[0]); $i++) {
             $texexp = '';
diff --git a/group/classes/output/user_groups_editable.php b/group/classes/output/user_groups_editable.php
index 9595a033568..aa6b98afd4b 100644
--- a/group/classes/output/user_groups_editable.php
+++ b/group/classes/output/user_groups_editable.php
@@ -98,7 +98,7 @@ class user_groups_editable extends \core\output\inplace_editable {
         }
 
         if (!empty($listofgroups)) {
-            $this->displayvalue = implode($listofgroups, ', ');
+            $this->displayvalue = implode(', ', $listofgroups);
         } else {
             $this->displayvalue = get_string('groupsnone');
         }
diff --git a/lib/google/readme_moodle.txt b/lib/google/readme_moodle.txt
index 15358b7e921..5aae6a3631f 100644
--- a/lib/google/readme_moodle.txt
+++ b/lib/google/readme_moodle.txt
@@ -38,6 +38,8 @@ Here are the files that we have added.
 
 Local changes (to reapply until upstream upgrades contain them):
     * MDL-67034 php74 compliance fixes
+    * MDL-67115 php74 implode() compliance fixes. This is fixed in upstream library v2.2.4
+      (verify that https://github.com/googleapis/google-api-php-client/pull/1683 is applied)
 
 
 Information
diff --git a/lib/google/src/Google/Http/REST.php b/lib/google/src/Google/Http/REST.php
index 491c06846e6..b6900461ef9 100644
--- a/lib/google/src/Google/Http/REST.php
+++ b/lib/google/src/Google/Http/REST.php
@@ -170,7 +170,7 @@ class Google_Http_REST
     }
 
     if (count($queryVars)) {
-      $requestUrl .= '?' . implode($queryVars, '&');
+      $requestUrl .= '?' . implode('&', $queryVars);
     }
 
     return $requestUrl;
diff --git a/lib/htmlpurifier/HTMLPurifier/Printer/HTMLDefinition.php b/lib/htmlpurifier/HTMLPurifier/Printer/HTMLDefinition.php
index 679d19ba3a1..c18cd95d5e2 100644
--- a/lib/htmlpurifier/HTMLPurifier/Printer/HTMLDefinition.php
+++ b/lib/htmlpurifier/HTMLPurifier/Printer/HTMLDefinition.php
@@ -43,8 +43,8 @@ class HTMLPurifier_Printer_HTMLDefinition extends HTMLPurifier_Printer
         $ret .= $this->element('caption', 'Doctype');
         $ret .= $this->row('Name', $doctype->name);
         $ret .= $this->row('XML', $doctype->xml ? 'Yes' : 'No');
-        $ret .= $this->row('Default Modules', implode($doctype->modules, ', '));
-        $ret .= $this->row('Default Tidy Modules', implode($doctype->tidyModules, ', '));
+        $ret .= $this->row('Default Modules', implode(', ', $doctype->modules));
+        $ret .= $this->row('Default Tidy Modules', implode(', ', $doctype->tidyModules));
         $ret .= $this->end('table');
         return $ret;
     }
diff --git a/lib/htmlpurifier/readme_moodle.txt b/lib/htmlpurifier/readme_moodle.txt
index 1195367485d..d0f76044dbf 100644
--- a/lib/htmlpurifier/readme_moodle.txt
+++ b/lib/htmlpurifier/readme_moodle.txt
@@ -21,3 +21,5 @@ Modifications:
   Check status of https://github.com/ezyang/htmlpurifier/pull/148
 * MDL-67030 applied https://github.com/ezyang/htmlpurifier/pull/224 towards
   php74 compatibility.
+* MDL-67115 applied https://github.com/ezyang/htmlpurifier/pull/243 towards
+  php74 compatibility.
diff --git a/lib/listlib.php b/lib/listlib.php
index 25ed2660e4a..67520aebbcd 100644
--- a/lib/listlib.php
+++ b/lib/listlib.php
@@ -552,7 +552,7 @@ abstract class list_item {
         } else {
             $childrenhtml = '';
         }
-        return $this->item_html($extraargs).'&nbsp;'.(join($this->icons, '')).(($childrenhtml !='')?("\n".$childrenhtml):'');
+        return $this->item_html($extraargs).'&nbsp;'.(join('', $this->icons)).(($childrenhtml !='')?("\n".$childrenhtml):'');
     }
 
     public function set_icon_html($first, $last, $lastitem) {
diff --git a/lib/minify/matthiasmullie-minify/src/CSS.php b/lib/minify/matthiasmullie-minify/src/CSS.php
index e5a4669074c..a9a70a0460a 100644
--- a/lib/minify/matthiasmullie-minify/src/CSS.php
+++ b/lib/minify/matthiasmullie-minify/src/CSS.php
@@ -525,7 +525,7 @@ class CSS extends Minify
         );
 
         return preg_replace_callback(
-            '/(?<=[: ])('.implode(array_keys($colors), '|').')(?=[; }])/i',
+            '/(?<=[: ])('.implode('|', array_keys($colors)).')(?=[; }])/i',
             function ($match) use ($colors) {
                 return $colors[strtoupper($match[0])];
             },
diff --git a/lib/minify/readme_moodle.txt b/lib/minify/readme_moodle.txt
index e0785d0b251..9593ad066d5 100644
--- a/lib/minify/readme_moodle.txt
+++ b/lib/minify/readme_moodle.txt
@@ -8,3 +8,9 @@ mv minify-1.3.51/data /path/to/moodle/lib/minify/matthiasmullie-minify/
 2) Download https://github.com/matthiasmullie/path-converter/archive/1.1.0.zip and unzip
 
 mv path-converter-1.1.0/src/ /path/to/moodle/lib/minify/matthiasmullie-pathconverter/
+
+Local changes applied:
+
+MDL-67115: php 74 compliance - implode() params order. Note this has been fixed upstream
+  by https://github.com/matthiasmullie/minify/pull/300 so, whenever this library is updated
+  check if the fix is included and remove this note.
diff --git a/lib/questionlib.php b/lib/questionlib.php
index 8566321a1e1..9fa33f9f2ad 100644
--- a/lib/questionlib.php
+++ b/lib/questionlib.php
@@ -1420,7 +1420,7 @@ function question_category_options($contexts, $top = false, $currentcat = 0,
     foreach ($contexts as $context) {
         $pcontexts[] = $context->id;
     }
-    $contextslist = join($pcontexts, ', ');
+    $contextslist = join(', ', $pcontexts);
 
     $categories = get_categories_for_contexts($contextslist, 'parent, sortorder, name ASC', $top);
 
@@ -2011,7 +2011,7 @@ class question_edit_contexts {
      */
     public function require_one_cap($caps) {
         if (!$this->have_one_cap($caps)) {
-            $capsstring = join($caps, ', ');
+            $capsstring = join(', ', $caps);
             print_error('nopermissions', '', '', $capsstring);
         }
     }
diff --git a/lib/tests/behat/behat_navigation.php b/lib/tests/behat/behat_navigation.php
index 58abfafc836..52760799bb0 100644
--- a/lib/tests/behat/behat_navigation.php
+++ b/lib/tests/behat/behat_navigation.php
@@ -300,7 +300,7 @@ class behat_navigation extends behat_base {
         // Throw exception if no node found.
         if (!$nodetoclick) {
             throw new ExpectationException('Navigation node "' . $nodetext . '" not found under "' .
-                implode($parentnodes, ' > ') . '"', $this->getSession());
+                implode(' > ', $parentnodes) . '"', $this->getSession());
         }
         $nodetoclick->click();
     }
diff --git a/lib/tests/other/pdflibtestpage.php b/lib/tests/other/pdflibtestpage.php
index 3263829e56b..e4f6fb4d1cd 100644
--- a/lib/tests/other/pdflibtestpage.php
+++ b/lib/tests/other/pdflibtestpage.php
@@ -104,7 +104,7 @@ if ($getpdf) {
         }
         $list[] = $f;
     }
-    $c .= implode($list, ', ');
+    $c .= implode(', ', $list);
     $c .= '<p><i><small>Note: * Standard core fonts are not embedded in PDF files, PDF viewers are using local fonts.</small></i></p>';
 
     $c .= '<h3>Installed languages and their alphabets</h3>';
diff --git a/mod/glossary/lib.php b/mod/glossary/lib.php
index 2372c35f971..2615e43e456 100644
--- a/mod/glossary/lib.php
+++ b/mod/glossary/lib.php
@@ -570,13 +570,13 @@ function glossary_print_recent_activity($course, $viewfullnames, $timestart) {
 
     $joins = array(' FROM {glossary_entries} ge ');
     $joins[] = 'JOIN {user} u ON u.id = ge.userid ';
-    $fromsql = implode($joins, "\n");
+    $fromsql = implode("\n", $joins);
 
     $params['timestart'] = $timestart;
     $clausesql = ' WHERE ge.timemodified > :timestart ';
 
     if (count($approvals) > 0) {
-        $approvalsql = 'AND ('. implode($approvals, ' OR ') .') ';
+        $approvalsql = 'AND ('. implode(' OR ', $approvals) .') ';
     } else {
         $approvalsql = '';
     }
diff --git a/question/editlib.php b/question/editlib.php
index d0dfbf87c74..f1360717795 100644
--- a/question/editlib.php
+++ b/question/editlib.php
@@ -490,7 +490,7 @@ function question_build_edit_resources($edittab, $baseurl, $params) {
     foreach ($contexts->having_one_edit_tab_cap($edittab) as $context){
         $contextlistarr[] = "'{$context->id}'";
     }
-    $contextlist = join($contextlistarr, ' ,');
+    $contextlist = join(' ,', $contextlistarr);
     if (!empty($pagevars['cat'])){
         $catparts = explode(',', $pagevars['cat']);
         if (!$catparts[0] || (false !== array_search($catparts[1], $contextlistarr)) ||
diff --git a/question/format/examview/format.php b/question/format/examview/format.php
index e2e1a9af611..e092a877c44 100644
--- a/question/format/examview/format.php
+++ b/question/format/examview/format.php
@@ -164,7 +164,7 @@ class qformat_examview extends qformat_based_on_xml {
         $questions = array();
         $currentquestion = array();
 
-        $text = implode($lines, ' ');
+        $text = implode(' ', $lines);
         $text = $this->cleanunicode($text);
 
         $xml = xmlize($text, 0);
diff --git a/question/format/examview/tests/examviewformat_test.php b/question/format/examview/tests/examviewformat_test.php
index 601650fd27c..ab19677d8a1 100644
--- a/question/format/examview/tests/examviewformat_test.php
+++ b/question/format/examview/tests/examviewformat_test.php
@@ -252,7 +252,7 @@ class qformat_examview_test extends question_testcase {
         $lines = $this->make_test_xml();
 
         $importer = new qformat_examview();
-        $text = implode($lines, ' ');
+        $text = implode(' ', $lines);
 
         $xml = xmlize($text, 0);
         $importer->parse_matching_groups($xml['examview']['#']['matching-group']);
diff --git a/user/classes/output/user_roles_editable.php b/user/classes/output/user_roles_editable.php
index 12fc5c51e7b..4ee19611b61 100644
--- a/user/classes/output/user_roles_editable.php
+++ b/user/classes/output/user_roles_editable.php
@@ -128,7 +128,7 @@ class user_roles_editable extends \core\output\inplace_editable {
         }
 
         if (!empty($listofroles)) {
-            $this->displayvalue = implode($listofroles, ', ');
+            $this->displayvalue = implode(', ', $listofroles);
         } else if (!empty($roleids) && empty($viewableroleids)) {
             $this->displayvalue = get_string('novisibleroles', 'role');
         } else {