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Posted by Captain Paralytic on 10/15/07 13:17
On 15 Oct, 14:09, WildernessCat <wilderness...@gmail.com> wrote:
> Hello there!
>
> Suppose I have an associative array that looks like this:
> $arr['alpha_1'] = 'some value';
> $arr['alpha_3'] = 'some value';
> $arr['alpha_4'] = 'some value';
> $arr['beta_2'] = 'some value';
> $arr['beta_4'] = 'some value';
> $arr['beta_6'] = 'some value';
> $arr['gamma_1'] = 'some value';
> $arr['gamma_5'] = 'some value';
> $arr['gamma_6'] = 'some value';
> $arr['gamma_7'] = 'some value';
>
> Let's assume that the array is reasonably large (hundreds of entries).
>
> Is there an efficient way of getting all the items whose key starts
> with 'beta'? (without doing a foreach/strncmp loop?)
>
> Thanks in advance,
> Danny
Something like:
preg_grep('/^beta/',array_keys($arr));
should give you all the keys that start with 'beta'
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