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<?php $range = array_merge(range(ord('a'), ord('z')),range(ord('A'), ord('Z')));?> <table><?= implode("\n", array_map(function($i) {return sprintf('<tr><td>%s</td></tr>', chr($i));}, $range)); ?></table>
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<table><tr><td>a</td></tr> <tr><td>b</td></tr> <tr><td>c</td></tr> <tr><td>d</td></tr> <tr><td>e</td></tr> <tr><td>f</td></tr> <tr><td>g</td></tr> <tr><td>h</td></tr> <tr><td>i</td></tr> <tr><td>j</td></tr> <tr><td>k</td></tr> <tr><td>l</td></tr> <tr><td>m</td></tr> <tr><td>n</td></tr> <tr><td>o</td></tr> <tr><td>p</td></tr> <tr><td>q</td></tr> <tr><td>r</td></tr> <tr><td>s</td></tr> <tr><td>t</td></tr> <tr><td>u</td></tr> <tr><td>v</td></tr> <tr><td>w</td></tr> <tr><td>x</td></tr> <tr><td>y</td></tr> <tr><td>z</td></tr> <tr><td>A</td></tr> <tr><td>B</td></tr> <tr><td>C</td></tr> <tr><td>D</td></tr> <tr><td>E</td></tr> <tr><td>F</td></tr> <tr><td>G</td></tr> <tr><td>H</td></tr> <tr><td>I</td></tr> <tr><td>J</td></tr> <tr><td>K</td></tr> <tr><td>L</td></tr> <tr><td>M</td></tr> <tr><td>N</td></tr> <tr><td>O</td></tr> <tr><td>P</td></tr> <tr><td>Q</td></tr> <tr><td>R</td></tr> <tr><td>S</td></tr> <tr><td>T</td></tr> <tr><td>U</td></tr> <tr><td>V</td></tr> <tr><td>W</td></tr> <tr><td>X</td></tr> <tr><td>Y</td></tr> <tr><td>Z</td></tr></table>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
<table><?= implode("\n", array_map(function($i) {return sprintf('<tr><td>%s</td></tr>', chr($i));}, $range)); ?></table>

preferences:
226.17 ms | 403 KiB | 356 Q