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Asked: 2026-06-09T12:19:15+00:00

Is there a limit on a value string in php Associative array? I have

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Is there a limit on a value string in php Associative array?

I have a query that returns value of GROUP_CONCAT as CSV for an array element. When I run the query directly, I see all values being returned. When I print the array in PHP, the string is truncated.

Not sure how get around it?
Any ideas?

More info:
I just var_dump the results I got from query. Here it is.
It shows 1024. Looks like there is a limit. What is it?

  array(5) {
   ["FIELD_ID"]=>
      string(3) "232"
   ["answers"]=>
      string(1024) "48,50,52,54,56,989,990,991,992,993,994,995,996,997,998,999,1000,1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,1033,1034,1035,1036,1037,1038,1039,1040,1041,1042,1043,1044,1045,1046,1047,1048,1049,1050,1051,1052,1053,1054,1055,1056,1057,1058,1059,1060,1061,1062,1063,1064,1065,1066,1067,1068,1069,1070,1071,1072,1073,1074,1075,1076,1077,1078,1079,1080,1081,1082,1083,1084,1085,1086,1087,1088,1089,1090,1091,1092,1093,1094,1095,1096,1097,1098,1099,1100,1101,1102,1103,1104,1105,1106,1107,1108,1109,1110,1111,1112,1113,1114,1115,1116,1117,1118,1119,1120,1121,1122,1123,1124,1125,1126,1127,1128,1129,1130,1131,1132,1133,1134,1135,1136,1137,1138,1139,1140,1141,1142,1143,1144,1145,1146,1147,1148,1149,1150,1151,1152,1153,1154,1155,1156,1157,1158,1159,1160,1161,1162,1163,1164,1165,1166,1167,1168,1169,1170,1171,1172,1173,1174,1175,1176,1177,1178,1179,1180,1181,1182,1183,1184,1185,1186,1187,1188,1189,1190,1191,1192,"
     ["ANSWER_TYPE"]=>
     string(2) "SS"
   ["FIELD_TYPE"]=>
     string(2) "DA"
   ["main_field_name"]=>
    string(0) ""
  }

More Info:
The issue still exists even after setting the variable group_concat_max_len to 5000. Any other ideas? Any issues with PDO?

After restarting MySQL, it works. Thanks!

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1 Answer

  1. Editorial Team

    You might need to read up on the length of the max concat here.

    Command-Line Format        --group_concat_max_len=#
Option-File Format         group_concat_max_len
Option Sets Variable       Yes, group_concat_max_len
Variable Name              group_concat_max_len
Variable Scope  Global, Session

Dynamic Variable           Yes
  -- Permitted Values
Platform Bit Size          32
Type                       numeric
Default                    1024
Range                      4 .. 4294967295

  -- Permitted Values
Platform Bit Size          64
Type                       numeric
Default                    1024
Range                      4 .. 18446744073709547520

    Edit: I find it rather amusing that the string that is returned to you is 1024 in length – which just happens to be the default max length in mysql. Coincedence?

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