PHP common functions

array function
array_chunk //Split an array into multiple arrays
array_key_exists //Check whether the given key name or index exists in the array
array_keys //Return all the key names in the array and form New array
array_merge                          // Merge one or more arrays, rebuild the index
array_values                                                                                                                                                      // Sort the array in reverse order and keep the index Relationship
asort                                                                                                                                                                                                                   . //Return the current key/value in the array and move the array pointer forward One step /End // point the internal pointer of the array to the last unit
extract // from the array to the current symbol table (the key name is the name of the variable, the key value is the value of the variable)
In_array // Check the inspection Whether a certain value exists in the array
key                                                                                                                                                                  // Sort the array by key name
list Some variables,
next                                                                                                                                                                                                                                                        // Move the internal pointer in the array forward by one position A unit
sort                                                                                                                                                                                                                                                                                  ; SORT_REGULAR - Normal comparison of units (no change of type), SORT_NUMERIC - Units are compared as numbers, units are compared as strings, units are compared as strings according to the current locale settings
Time date row number


date
gmdate
gmmktime
microtime
time

File system function
basename
chmod
copy
delete/unlink
dirname
fopen/flock/fread/fwrite/fclose
file_exists
file_get_contents
file_put_contents
file
fileatime
filemtime
filesize
ftruncate
is_dir
is_file
is_readable
is_uploaded_file
is_writable
mkdir
move_uploaded_file
rename
rmdir
touch
unlink

mathematical function
abs
ceil
floor
max
min


Mysql function
mysql_connect/mysql_pconnect
mysql_error
mysql_errno
mysql_fetch_array
mysql_fetch_field
mysql_fetch_row
mysql_insert_id
mysql_query

String processing function
addslashes
echo
explode
join
md5
print
//sprintf
str_replace
strstr
strip_tags
stripslashes
strlen
strpos
strtolower
strtouper
substr
trim

URL function library
base64_decode
base64_encode
rawurldecode
rawurlencode
urldecode
urlencode

Variable function
empty
floatval
get_defined_vars
gettype
intval
is_array
is_bool
is_float
is_int
is_null
is_numeric
is_object
is_resource
is_string
isset
print_r
settype
strval
unset
var_dump

php.ini
short_open_tag on
asp_tags off
disable_functions
display_errors on
track_errors on
register_globals off
post_max_size
extension_dir = "./ext"
enable_dl off

extension=php_gd2.dll
extension=php_mbstring.dll
extension=php_mysql.dll