php - How to split characters with "-" character? -


i generated serial number php, length of serial number 16 characters, want split serial number in 4 characters dash(-) character, format xxxx-xxxx-xxxx-xxxx wrote php code:

for ($d=0; $d<=3; $d++){      $tmp .= ($tmp ? "-" : null).substr($serial,$d,4); }

so loop return serial number xxxx-xxxx-xxxx-xxxx format,

i want know there better way or function in php?

i searched in internet found sprintf , number_format don't know how can use function format !

i use str_split() , implode():

$result = implode( '-', str_split( $serial, 4));

str_split() break string array, each element has 4 characters. then, implode() joins array pieces dash.

so, if generate random $serial with:

$serial = substr(md5(uniqid(rand(), true)), 0, 16);

we as output similar to:

59e6-997f-8446-80a2

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