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I need to split multiple data packets to single chunk

$packets=" *TS01,868323025167807,205004181116,GPS:3;S33.792541;E151.066264;58;347;1.46,STT:202;0,MGR:1555391,ADC:0;13.84;1;38.89;2;4.14,EVT:1#*TS01,868323025167807,205104181116,GPS:3;S33.786623;E151.060349;66;309;1.10,STT:202;0,MGR:1556426,ADC:0;13.78;1;38.70;2;4.14,EVT:1#*TS01,868323025167807,205204181116,GPS:3;S33.779947;E151.052654;47;313;1.10,STT:202;0,MGR:1557577,ADC:0;13.65;1;38.70;2;4.14,EVT:1#*TS01,868323025167807,205304181116,GPS:3;S33.776746;E151.051546;52;346;1.09,STT:202;0,MGR:1557980,ADC:0;13.85;1;38.14;2;4.14,EVT:1#*TS01,868323025167807,205404181116,GPS:3;S33.768219;E151.048295;63;338;1.08,STT:202;0,MGR:1559134,ADC:0;13.62;1;37.95;2;4.14,EVT:1#*TS01,868323025167807,205504181116,GPS:3;S33.763735;E151.047204;0;0;1.08,STT:202;0,MGR:1559699,ADC:0;12.84;1;37.95;2;4.14,EVT:1#*TS01,868323025167807,205518181116,GPS:3;S33.763707;E151.047218;0;0;1.07,STT:2;0,MGR:1559699,ADC:0;12.84;1;37.95;2;4.14,EVT:F0;200#";

One valid packet looks like below

*TS01,868323025167807,205004181116,GPS:3;S33.792541;E151.066264;58;347;1.46,STT:202;0,MGR:1555391,ADC:0;13.84;1;38.89;2;4.14,EVT:1#

Means every packet start with * and end with #

I did the following

$no_of_packets=substr_count($packets, '*'); if($no_of_packets>1){ //explode with # $packets=explode("#",$msg) }

I got array like below

[0] => *TS01,868323025167807,205004181116,GPS:3;S33.792541;E151.066264;58;347;1.46,STT:202;0,MGR:1555391,ADC:0;13.84;1;38.89;2;4.14,EVT:1 [1] => *TS01,868323025167807,205104181116,GPS:3;S33.786623;E151.060349;66;309;1.10,STT:202;0,MGR:1556426,ADC:0;13.78;1;38.70;2;4.14,EVT:1 [2] => *TS01,868323025167807,205204181116,GPS:3;S33.779947;E151.052654;47;313;1.10,STT:202;0,MGR:1557577,ADC:0;13.65;1;38.70;2;4.14,EVT:1 [3] => *TS01,868323025167807,205304181116,GPS:3;S33.776746;E151.051546;52;346;1.09,STT:202;0,MGR:1557980,ADC:0;13.85;1;38.14;2;4.14,EVT:1 [4] => *TS01,868323025167807,205404181116,GPS:3;S33.768219;E151.048295;63;338;1.08,STT:202;0,MGR:1559134,ADC:0;13.62;1;37.95;2;4.14,EVT:1 [5] => *TS01,868323025167807,205504181116,GPS:3;S33.763735;E151.047204;0;0;1.08,STT:202;0,MGR:1559699,ADC:0;12.84;1;37.95;2;4.14,EVT:1 [6] => *TS01,868323025167807,205518181116,GPS:3;S33.763707;E151.047218;0;0;1.07,STT:2;0,MGR:1559699,ADC:0;12.84;1;37.95;2;4.14,EVT:F0;200

The '#' is missing . If i go thru the loop and append '#' to each packets it will be too slow as I have 1000+ packets sometime

I need to preserve '#' and split by '#'

I tried the solution from Is there way to keep delimiter while using php explode or other similar functions? but it gave last empty array too

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2 Answers 2

Reset to default
2

The best is to set empty separator and use positive look behind / look ahead for # character and any character respectively:

$list = preg_split('/(?<=#)(?=.)/', $msg);

(?<=#) is positive look behind for # character, (?=.) is positive look ahead for any character (this avoids generating empty string at the end).

Actually, if * is part of separator, the following regexp would work even better (more reliably):

$list = preg_split('/(?<=#)(?=\*)/', $msg);
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1 Comment

(?=.) is awesome
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This code will help you for getting you your desired output - 

$arr = explode("*", $packets); array_shift($arr); $result = array(); for($i = 0; $i<count($arr); $i++){ array_push($result, "*".$arr[$i]); } print_r($result);
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I am not sure why this has been down-voted, it works and it should be faster in execution than the excepted answer.

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