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<?php $x = ' 6 \ntriangleleft 7 \ntriangleright 8 \nleftarrow 9 \nrightarrow : \nLeftarrow ; \nRightarrow < \nLeftrightarrow = \nleftrightarrow > \divideontimes ? \varnothing @ \nexists ` \Finv a \Game 0 \mho ð \eth h \eqsim i \beth j \gimel k \daleth l \lessdot m \gtrdot n \ltimes o \rtimes p \shortmid q \shortparallel r \smallsetminus s \thicksim t \thickapprox u \approxeq v \succapprox w \precapprox x \curvearrowleft y \curvearrowright z \digamma { \varkappa k \Bbbk } \hslash ~ \hbar \backepsilon 4 \preccurlyeq 5 \leqq 6 \leqslant 7 \lessgtr 8 \backprime : \risingdotseq ; \fallingdotseq < \succcurlyeq = \geqq > \geqslant ? \gtrless < \sqsubset = \sqsupset B \vartriangleright C \vartriangleleft D \trianglerighteq E \trianglelefteq F \bigstar G \between H \blacktriangledown I \blacktriangleright J \blacktriangleleft M \vartriangle N \blacktriangle O \triangledown P \eqcirc Q \lesseqgtr R \gtreqless S \lesseqqgtr T \gtreqqless V \Rrightarrow W \Lleftarrow Y \veebar Z \barwedge [ \doublebarwedge \ \angle ] \measuredangle ^ \sphericalangle _ \varpropto ` \smallsmile a \smallfrown b \Subset c \Supset d \Cup d \doublecup e \Cap e \doublecap f \curlywedge g \curlyvee h \leftthreetimes i \rightthreetimes j \subseteqq k \supseteqq l \bumpeq m \Bumpeq n \lll n \llless o \ggg o \gggtr s \circledS t \pitchfork u \dotplus v \backsim w \backsimeq { \complement | \intercal } \circledcirc ~ \circledast \circleddash 􀀀 \lvertneqq \gvertneqq \nleq \ngeq \nless \ngtr \nprec \nsucc \lneqq \gneqq \nleqslant \ngeqslant \lneq \gneq \npreceq \nsucceq \precnsim \succnsim \lnsim \gnsim \nleqq \ngeqq \precneqq \succneqq \precnapprox \succnapprox \lnapprox \gnapprox \nsim \ncong \diagup \diagdown \varsubsetneq ! \varsupsetneq " \nsubseteqq # \nsupseteqq $ \subsetneqq % \supsetneqq & \varsubsetneqq \varsupsetneqq ( \subsetneq ) \supsetneq * \nsubseteq + \nsupseteq , \nparallel - \nmid . \nshortmid / \nshortparallel 0 \nvdash 1 \nVdash 2 \nvDash 3 \nVDash 4 \ntrianglerighteq 5 \ntrianglelefteq 2 \boxdot \boxplus \boxtimes \square \blacksquare \centerdot \lozenge \blacklozenge \circlearrowright \circlearrowleft \rightleftharpoons \leftrightharpoons \boxminus \Vdash \Vvdash \vDash \twoheadrightarrow \twoheadleftarrow \leftleftarrows \rightrightarrows \upuparrows \downdownarrows \upharpoonright \restriction \downharpoonright \upharpoonleft \downharpoonleft \rightarrowtail \leftarrowtail \leftrightarrows \rightleftarrows \Lsh \Rsh \rightsquigarrow ! \leftrightsquigarrow " \looparrowleft # \looparrowright $ \circeq % \succsim & \gtrsim \gtrapprox ( \multimap ) \therefore * \because + \doteqdot + \Doteq , \triangleq - \precsim . \lesssim / \lessapprox 0 \eqslantless 1 \eqslantgtr 2 \curlyeqprec 3 \curlyeqsucc 1 '; $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"; }