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Returns the error string of the last json_encode() or json_decode() call
JSON Functions
PHP Manual

json_last_error_msg

(PHP 5 >= 5.5.0)

json_last_error_msg — Returns the error string of the last json_encode() or json_decode() call

Description

string json_last_error_msg ( void )

Parameters

This function has no parameters.

Return Values

Returns the error message on success or NULL with wrong parameters.

See Also

JSON Functions
PHP Manual