方法1:a~z
foreach(range('A', 'Z') as $letter1) { foreach(range('A', 'Z') as $letter2) { echo $letter1 . $letter2; } }
方法2:aa~zz
for ($i = 'AA'; $i !== 'ZZ'; $i++){ echo $i.'<br>'; }
方法3:a~zzz
$letters = array(); $letter = 'A'; while ($letter !== 'AAA') { $letters[] = $letter++; }
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