PHP Date and Time Functions
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PHP Regular Expressions Functions
Regular Expressions Syntax
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^
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Start of string
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$
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End of string
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.
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Any single character
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(a|b)
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a or b
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(…)
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Group section
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[abc]
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In range (a, b or c)
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[^abc]
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Not in range
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\s
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White space
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a?
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Zero or one of a
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a*
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Zero or more of a
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a*?
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Zero or more, ungreedy
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a+
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One or more of a
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a+?
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One or more, ungreedy
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a{3}
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Exactly 3 of a
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a{3,}
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3 or more of a
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a{,6}
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Up to 6 of a
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a{3,6}
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3 to 6 of a
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a{3,6}?
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3 to 6 of a, ungreedy
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\
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Escape character
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[:punct:]
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Any punctuation symbol
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[:space:]
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Any space character
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[:blank:]
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Space or tab
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Pattern Modifiers
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g
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Global match
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i *
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Case-insensitive
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m *
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Multiple lines
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s *
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Treat string as single line
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x *
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Allow comments and whitespace in pattern
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e *
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Evaluate replacement
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U *
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Ungreedy pattern
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PHP fopen() Modes
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r
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Read
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r+
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Read and write, prepend
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w
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Write, truncate
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w+
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Read and write, truncate
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a
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Write, append
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a+
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Read and write, append
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PHP Date Formatting
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Y
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4 digit year (2008)
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y
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2 digit year (08)
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F
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Long month (January)
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M
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Short month (Jan)
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m
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Month ⁴ (01 to 12)
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n
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Month (1 to 12)
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D
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Short day name (Mon)
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l
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Long day name (Monday) (lowercase L)
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d
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Day ⁴ (01 to 31)
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j
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Day (1 to 31)
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h
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12 Hour ⁴ (01 to 12)
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g
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12 Hour (1 to 12)
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H
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24 Hour ⁴ (00 to 23)
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G
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24 Hour (0 to 23)
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i
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Minutes ⁴ (00 to 59)
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s
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Seconds ⁴ (00 to 59)
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w
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Day of week ¹ (0 to 6)
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z
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Day of year (0 to 365)
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W
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Week of year ² (1 to 53)
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t
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Days in month (28 to 31)
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a
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am or pm
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A
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AM or PM
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B
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Swatch Internet Time (000 to 999)
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S
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Ordinal Suffix (st, nd, rd, th)
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T
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Timezone of machine (GMT)
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Z
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Timezone offset (seconds)
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O
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GMT offset (hours) (+0200)
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I
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Daylight saving (1 or 0)
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L
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Leap year (1 or 0)
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U
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Seconds since Epoch ³
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c
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ISO 8601 (PHP 5) (2008-07-31T18:30:13+01:00)
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r
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RFC 2822 (Thu, 31 Jul 2008 18:30:13 +0100)
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¹ 0 is Sunday, 6 is Saturday.
² Week that overlaps two years belongs to year that contains most days of that week. Hence week number for 1st January of a given year can be 53 if week belongs to previous year. date(«W», mktime(0, 0, 0, 12, 8, $year)) always gives correct number of weeks in $year.
³ The Epoch is the 1st January 1970.
⁴ With leading zeroes
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