28 lines
655 B
PHP
28 lines
655 B
PHP
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<?php
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function is_geometric($arr)
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{
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if (sizeof($arr) <= 1)
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return True;
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# Calculate ratio
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$ratio = $arr[1]/$arr[0];
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# Check the ratio of the remaining
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for($i=1; $i<sizeof($arr); $i++)
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{
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if (($arr[$i]/($arr[$i-1])) != $ratio)
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{
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return "Not an geometric sequence";
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}
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}
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return "Geometric sequence";
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}
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$my_arr1 = array(2, 6, 18, 54);
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$my_arr2 = array(10, 5, 2.5, 1.20);
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print_r(is_geometric($my_arr1)."\n");
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print_r(is_geometric($my_arr2)."\n");
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?>
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Output:
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Geometric sequence
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Not an geometric sequence
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