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-2.2.1.58	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.57	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.56	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.55	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.54	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.53	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.52	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.51	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.50	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.49	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.48	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.47	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.46	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.45	tracks/php/exercises/collatz-conjecture/example.php