Online PHP editor | refs for eiMHn

<?php $x = ' \Downarrow \Leftarrow \Leftrightarrow \Longleftarrow \Longleftrightarrow \Longrightarrow \Rightarrow \Uparrow \Updownarrow \downarrow \hookleftarrow \hookrightarrow \leftarrow \leftharpoondown \leftharpoonup \leftrightarrow \longleftarrow \longleftrightarrow \longmapsto \longrightarrow \mapsto \nearrow \nwarrow \rightarrow \rightharpoondown \rightharpoonup \rightleftharpoons \searrow \swarrow \uparrow \updownarrow '; $x = array_filter(preg_split('/\s+/', $x)); usort($x, function ($a, $b) { return strcmp(strtolower($a), strtolower($b)); }); foreach ($x as $xx) { echo $xx, "\n"; }