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<?php
 
$s = '45.51088930166307,51,52.52216552154544,75';
$res = preg_split('~,(?=\d+\.)~', $s);
print_r($res);

Success #stdin #stdout 0.01s 82624KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => 45.51088930166307,51
    [1] => 52.52216552154544,75
)

https://ideone.com/TzDmcG

language:

PHP (php 7.3.5)

created:

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