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-2.2.1.119	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.118	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.117	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.116	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.115	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.114	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.113	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.111	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.110	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.109	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.108	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.107	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.106	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.105	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.104	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.103	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.102	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.101	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.100	tracks/php/exercises/collatz-conjecture/example.php
trackler-2.2.1.99	tracks/php/exercises/collatz-conjecture/example.php