Palindrome detection: Difference between revisions
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→{{header|Phix}}: added syntax colouring the hard way
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=={{header|Phix}}==
<!--<lang Phix>
<span style="color: #008080;">function</span> <span style="color: #000000;">is_palindrome</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">==</span><span style="color: #7060A8;">reverse</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">is_palindrome</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"rotator"</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- prints 1</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">is_palindrome</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"tractor"</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- prints 0</span>
<span style="color: #008080;">constant</span> <span style="color: #000000;">punctuation</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">" `~!@#$%^&*()-=_+[]{}\\|;:',.<>/?"</span><span style="color: #0000FF;">,</span>
<span style="color: #000000;">nulls</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">punctuation</span><span style="color: #0000FF;">))</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">utf8_to_utf32</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">lower</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">substitute_all</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">,</span><span style="color: #000000;">punctuation</span><span style="color: #0000FF;">,</span><span style="color: #000000;">nulls</span><span style="color: #0000FF;">)))</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">==</span><span style="color: #7060A8;">reverse</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #000080;font-style:italic;">-- these all print 1 (true)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"Madam, I'm Adam."</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"A man, a plan, a canal: Panama!"</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"In girum imus nocte et consumimur igni"</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"人人為我,我為人人"</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"Я иду с мечем, судия"</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"아들딸들아"</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"가련하시다 사장집 아들딸들아 집장사 다시 하련가"</span><span style="color: #0000FF;">)</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">extra_credit</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"tregða, gón, reiði - er nóg að gert"</span><span style="color: #0000FF;">)</span>
<!--</lang>-->
=={{header|PHP}}==
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