The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
CRYPT_SALT_LENGTH
    (int)
   CRYPT_STD_DES
    (int)
   1.
    
   CRYPT_EXT_DES
    (int)
   1.
    
   CRYPT_MD5
    (int)
   1.
    
   CRYPT_BLOWFISH
    (int)
   1.
    
   CRYPT_SHA256
    (int)
   1.
    
   CRYPT_SHA512
    (int)
   1.
    
   HTML_SPECIALCHARS
    (int)
   HTML_ENTITIES
    (int)
   ENT_COMPAT
    (int)
   ENT_QUOTES
    (int)
   ENT_NOQUOTES
    (int)
   ENT_IGNORE
    (int)
   ENT_SUBSTITUTE
    (int)
   ENT_DISALLOWED
    (int)
   ENT_HTML401
    (int)
   ENT_XML1
    (int)
   ENT_XHTML
    (int)
   ENT_HTML5
    (int)
   CHAR_MAX
    (int)
   LC_CTYPE
    (int)
   LC_NUMERIC
    (int)
   LC_TIME
    (int)
   LC_COLLATE
    (int)
   LC_MONETARY
    (int)
   LC_ALL
    (int)
   LC_* constants affect.
    
   LC_MESSAGES
    (int)
   libintl.
    
   STR_PAD_LEFT
    (int)
   STR_PAD_RIGHT
    (int)
   STR_PAD_BOTH
    (int)
   | Constants | Description | 
|---|---|
    ABDAY_1
    (int)
    | 
   Abbreviated name of first day of the week. | 
    ABDAY_2
    (int)
    | 
   Abbreviated name of second day of the week. | 
    ABDAY_3
    (int)
    | 
   Abbreviated name of third day of the week. | 
    ABDAY_4
    (int)
    | 
   Abbreviated name of fourth day of the week. | 
    ABDAY_5
    (int)
    | 
   Abbreviated name of fifth day of the week. | 
    ABDAY_6
    (int)
    | 
   Abbreviated name of sixth day of the week. | 
    ABDAY_7
    (int)
    | 
   Abbreviated name of seventh day of the week. | 
    DAY_1
    (int)
    | 
   Name of the first day of the week. | 
    DAY_2
    (int)
    | 
   Name of the second day of the week. | 
    DAY_3
    (int)
    | 
   Name of the third day of the week. | 
    DAY_4
    (int)
    | 
   Name of the fourth day of the week. | 
    DAY_5
    (int)
    | 
   Name of the fifth day of the week. | 
    DAY_6
    (int)
    | 
   Name of the sixth day of the week. | 
    DAY_7
    (int)
    | 
   Name of the seventh day of the week. | 
    ABMON_1
    (int)
    | 
   Abbreviated name of the first month of the year. | 
    ABMON_2
    (int)
    | 
   Abbreviated name of the second month of the year. | 
    ABMON_3
    (int)
    | 
   Abbreviated name of the third month of the year. | 
    ABMON_4
    (int)
    | 
   Abbreviated name of the fourth month of the year. | 
    ABMON_5
    (int)
    | 
   Abbreviated name of the fifth month of the year. | 
    ABMON_6
    (int)
    | 
   Abbreviated name of the sixth month of the year. | 
    ABMON_7
    (int)
    | 
   Abbreviated name of the seventh month of the year. | 
    ABMON_8
    (int)
    | 
   Abbreviated name of the eighth month of the year. | 
    ABMON_9
    (int)
    | 
   Abbreviated name of the ninth month of the year. | 
    ABMON_10
    (int)
    | 
   Abbreviated name of the tenth month of the year. | 
    ABMON_11
    (int)
    | 
   Abbreviated name of the eleventh month of the year. | 
    ABMON_12
    (int)
    | 
   Abbreviated name of the twelfth month of the year. | 
    MON_1
    (int)
    | 
   Name of the first month of the year. | 
    MON_2
    (int)
    | 
   Name of the second month of the year. | 
    MON_3
    (int)
    | 
   Name of the third month of the year. | 
    MON_4
    (int)
    | 
   Name of the fourth month of the year. | 
    MON_5
    (int)
    | 
   Name of the fifth month of the year. | 
    MON_6
    (int)
    | 
   Name of the sixth month of the year. | 
    MON_7
    (int)
    | 
   Name of the seventh month of the year. | 
    MON_8
    (int)
    | 
   Name of the eighth month of the year. | 
    MON_9
    (int)
    | 
   Name of the ninth month of the year. | 
    MON_10
    (int)
    | 
   Name of the tenth month of the year. | 
    MON_11
    (int)
    | 
   Name of the eleventh month of the year. | 
    MON_12
    (int)
    | 
   Name of the twelfth month of the year. | 
    AM_STR
    (int)
    | 
   String for Ante meridian. | 
    PM_STR
    (int)
    | 
   String for Post meridian. | 
    D_T_FMT
    (int)
    | 
   String that can be used as the format string for strftime() to represent time and date. | 
    D_FMT
    (int)
    | 
   String that can be used as the format string for strftime() to represent date. | 
    T_FMT
    (int)
    | 
   String that can be used as the format string for strftime() to represent time. | 
    T_FMT_AMPM
    (int)
    | 
   String that can be used as the format string for strftime() to represent time in 12-hour format with ante/post meridian. | 
    ERA
    (int)
    | 
   Alternate era. | 
    ERA_YEAR
    (int)
    | 
   Year in alternate era format. | 
    ERA_D_T_FMT
    (int)
    | 
   Date and time in alternate era format (string can be used in strftime()). | 
    ERA_D_FMT
    (int)
    | 
   Date in alternate era format (string can be used in strftime()). | 
    ERA_T_FMT
    (int)
    | 
   Time in alternate era format (string can be used in strftime()). | 
    ALT_DIGITS
    (int)
    | 
   Alternative symbols for digits. | 
| Constants | Description | 
|---|---|
    INT_CURR_SYMBOL
    (int)
    | 
   International currency symbol. | 
    CURRENCY_SYMBOL
    (int)
    | 
   Local currency symbol. | 
    CRNCYSTR
    (int)
    | 
   
    
     Same value as CURRENCY_SYMBOL.
    
    | 
  
    MON_DECIMAL_POINT
    (int)
    | 
   Decimal point character. | 
    MON_THOUSANDS_SEP
    (int)
    | 
   Thousands separator (groups of three digits). | 
    MON_GROUPING
    (int)
    | 
   
    
     Like "grouping" element.
    
    | 
  
    POSITIVE_SIGN
    (int)
    | 
   Sign for positive values. | 
    NEGATIVE_SIGN
    (int)
    | 
   Sign for negative values. | 
    INT_FRAC_DIGITS
    (int)
    | 
   International fractional digits. | 
    FRAC_DIGITS
    (int)
    | 
   Local fractional digits. | 
    P_CS_PRECEDES
    (int)
    | 
   
    
     Returns 1 if CURRENCY_SYMBOL precedes a positive value.
    
    | 
  
    P_SEP_BY_SPACE
    (int)
    | 
   
    
     Returns 1 if a space separates CURRENCY_SYMBOL from a positive value.
    
    | 
  
    N_CS_PRECEDES
    (int)
    | 
   
    
     Returns 1 if CURRENCY_SYMBOL precedes a negative value.
    
    | 
  
    N_SEP_BY_SPACE
    (int)
    | 
   
    
     Returns 1 if a space separates CURRENCY_SYMBOL from a negative value.
    
    | 
  
    P_SIGN_POSN
    (int)
    | 
   
     
 
  | 
  
    N_SIGN_POSN
    (int)
    | 
   
| Constants | Description | 
|---|---|
    DECIMAL_POINT
    (int)
    | 
   Decimal point character. | 
    RADIXCHAR
    (int)
    | 
   
    
     Same value as DECIMAL_POINT.
    
    | 
  
    THOUSANDS_SEP
    (int)
    | 
   Separator character for thousands (groups of three digits). | 
    THOUSEP
    (int)
    | 
   
    
     Same value as THOUSANDS_SEP.
    
    | 
  
    GROUPING
    (int)
    | 
   
| Constants | Description | 
|---|---|
    YESEXPR
    (int)
    | 
   
    
     Regex string for matching "yes" input.
    
    | 
  
    NOEXPR
    (int)
    | 
   
    
     Regex string for matching "no" input.
    
    | 
  
    YESSTR
    (int)
    | 
   
    
     Output string for "yes".
    
    | 
  
    NOSTR
    (int)
    | 
   
    
     Output string for "no".
    
    | 
  
| Constants | Description | 
|---|---|
    CODESET
    (int)
    | 
   Return a string with the name of the character encoding. |