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-2.2.1.139	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.138	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.137	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.136	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.135	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.134	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.133	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.132	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.131	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.130	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.129	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.128	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.127	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.126	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.125	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.124	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.123	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.122	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.121	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.120	tracks/php/exercises/collatz-conjecture/example.php