<?php // string, null, bool, float, largest specified previous index function isIndexedArray($array) { return !(bool)count(array_filter(array_keys($array), 'is_string')); } var_dump(isIndexedArray('a')); // false var_dump(isIndexedArray(NULL)); // false var_dump(isSequentialArray([])); // true/undefined var_dump(isSequentialArray(['a'])); // true var_dump(isSequentialArray(['a' => 1])); // false array(1=>'a',2=>'b') empty string ['a' => 'a']; [1 => 'a']; [1,2,null,4] var_dump(isSequentialArray(array(0 => 'a', 1 => 'b'))); // true var_dump(isSequentialArray(array(0 => 'a', 5 => 'b'))); // true var_dump(isSequentialArray(array('a', 'b', 'c'))); // false var_dump(isSequentialArray(array("0" => 'a', "1" => 'b', "2" => 'c'))); // false var_dump(isSequentialArray(array("1" => 'a', "0" => 'b', "2" => 'c'))); // true var_dump(isSequentialArray(array("a" => 'a', "b" => 'b', "c" => 'c'))); // true
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