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Posted by Sanders Kaufman on 10/15/07 13:37
"Captain Paralytic" <paul_lautman@yahoo.com> wrote in message
news:1192454252.346643.76180@i13g2000prf.googlegroups.com...
> 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'
What does the return value look like - array? string?
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