What is the meaning of each name corresponding to the localeconv function of php?

After the output: the grouping and mon_grouping Health names indicate the meanings of the five types of values and the Health Names marked as & #039; not understood & #039. Please explain it in detail. thank you! I can't understand the manual.

After output:

What are the meanings of the five types of grouping and mon_grouping Health names?
And the health name marked as "not understand.
Please explain it in detail. thank you! I can't understand the manual.

Reply content:

After output:

What are the meanings of the five types of grouping and mon_grouping Health names?
And the health name marked as "not understand.
Please explain it in detail. thank you! I can't understand the manual.

• [Decimal_point]-decimal point character
• [Thousands_sep]-thousands separator
• [Int_curr_symbol]-currency symbol (for example, USD)
• [Currency_symbol]-currency symbol (for example, $)
• [Mon_decimal_point]-currency decimal point
• [Mon_thousands_sep]-currency thousands separator
• [Positive_sign]-positive value symbol
• [Negative_sign]-negative value symbol
• [Int_frac_digits]-International decimal number
• [Frac_digits]-local decimal number
• [P_cs_precedes]-if, if the currency symbol is before the positive value, True (1); otherwise, False (0 ).
• [P_sep_by_space]-True (1) If there is space between the currency symbol and the positive value, True (1); otherwise, False (0 ).
• [N_cs_precedes]-True (1) if the currency symbol is True (1) before the negative value; otherwise, False (0 ).
• [P_sep_by_space]-True (1) If there is space between the currency symbol and the negative value, True (1); otherwise, False (0 ).
• [P_sign_posn]-formatting options:
  
  
  • 0-parentheses around the number and currency symbol
  • 1-number + before the number and currency symbol
  • 2-plus signs after the number and currency symbol
  • 3-the plus sign before the currency symbol
  • 4-the plus sign after the currency symbol
• [N_sign_posn]-formatting options:
  
  
  • 0-parentheses around the number and currency symbol
  • 1-digit before the number and currency symbol
  • 2-the-number after the number and currency symbol
  • 3-the-number before the currency symbol
  • 4-the-number after the currency symbol
• [Grouping]-Array that shows how to group numbers (for example, 3 indicates 1 000 000)
• [Mon_grouping]-Array that shows how to group Currency numbers (for example, 2 indicates 1 00 00)
  --PHP localeconv () function

Okay, I have recovered T_T if I told you not to go to W3school.