<?php
$data = '20150825131738_262,20150825132227_241,20150825132254_898,20150825132320_209';
# Split data into individual fields
# Surround each field with single quotes
function ($field) { return "'${field}'"; },
$array
);
# Join fields back into a single string again
echo $data;
PD9waHAKCiRkYXRhID0gJzIwMTUwODI1MTMxNzM4XzI2MiwyMDE1MDgyNTEzMjIyN18yNDEsMjAxNTA4MjUxMzIyNTRfODk4LDIwMTUwODI1MTMyMzIwXzIwOSc7CgojIFNwbGl0IGRhdGEgaW50byBpbmRpdmlkdWFsIGZpZWxkcwokYXJyYXkgPSBleHBsb2RlKCcsJywgJGRhdGEpOwoKIyBTdXJyb3VuZCBlYWNoIGZpZWxkIHdpdGggc2luZ2xlIHF1b3RlcwokYXJyYXkgPSBhcnJheV9tYXAoCglmdW5jdGlvbiAoJGZpZWxkKSB7IHJldHVybiAiJyR7ZmllbGR9JyI7IH0sCgkkYXJyYXkKKTsKCiMgSm9pbiBmaWVsZHMgYmFjayBpbnRvIGEgc2luZ2xlIHN0cmluZyBhZ2FpbgokZGF0YSA9IGltcGxvZGUoJywnLCAkYXJyYXkpOwoKZWNobyAkZGF0YTs=