Contents

<?php

function steps($number)
{
    $stepCount = 0;
    if ($number < 1) {
        throw new InvalidArgumentException('Only positive numbers are allowed');
    }
    do {
        if ($number === 1) {
            break;
        }
        $stepCount++;
        $number = ( $number % 2 === 0 ? $number / 2 : 3 * $number + 1);
    } while ($number !== 0);

    return $stepCount;
}

Version data entries

134 entries across 134 versions & 1 rubygems

Version	Path
trackler-2.2.1.98	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.97	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.96	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.95	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.94	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.93	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.92	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.91	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.90	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.89	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.88	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.87	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.86	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.85	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.84	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.83	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.82	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.81	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.80	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.79	tracks/php/exercises/collatz-conjecture/example.php