php functions are the only way to learn php. What are the commonly used php functions? This article mainly shares with you a summary of commonly used PHP letters, hoping to help everyone.
array()
array(value1,value2…..) Create an array
array_chunk(array,size,preserve_keys) Split a number Into a new array block [tʃʌŋk]
array_combine(keys,values) Form a new array by merging two arrays (key array, key value array)
array_count_values( array) Used to count the number of occurrences of all values in the array
array_diff(array1,array2,...) Comparing arrays returns the difference between two arrays (only keys are compared Value)
array_diff_assoc(array1,array2,..) Compare arrays and return the difference set of two arrays (compare key names and key values)
array_diff_key( array1,array2,...) Comparing arrays returns the difference between two arrays (only comparing key names)
array_fill(index,number,value) Using the given Fill the array with key values
array_filter(array, the callback function to be used) Use the callback function to filter the elements in the array
array_flip(array) Reverse/exchange the key names in the array and the corresponding associated Key value [flɪp]
array_keys(array) possible An array [mɜ:rdʒ]
array_pad(array,size,value) Inserts the specified number of elements with the specified value into the array
array_pop(
array) array_push(array) (array
()) array_unshift(array
)) The first elementAddOne or more elementsarray_rand(array,number) Randomly select one from the array Or multiple arraysarray_replace(array1,array2...) Use the value of the following array to replace the value of the first array array_reverse(array) Reverse the array and return a new array array_search(value,array, strict(optional true, flase)) Search value returns key name. True searches for elements with the same key name and value array_slice(array,start,length,preserve) Returns the selected part of the array array_splice(array,start,length,array) Remove the specified elements and replace them with others array_unique(array) Delete duplicate values in the array US [juˈnik ] array_values(array) lapse out out out out of Error in the Array array) 返回数组中元素的数目美 [kaʊnt] ('值 ) Check whether the specified value exists in the array is set to TRUE, then the in_array function checks the search Whether the data and array values are of the same type. key(array array1, array2…) , none herself fieldtenttenttenttent the the given the value of the array assigned to some Array variable Array ) to sort the associated array key name array ) #arsort( ) Sort the associative array in descending order by key valueasort( ) Sort the associative array in ascending order of key value strtolower(string) Convert the string to lowercase letters strtoupper(string) Convert the string to uppercase lettersstrtr(" string”,”from”,””to”) Convert the undetermined characters in the string substr(string,start, length) Return a part of the string substr_count( ) Calculate the number of times a substring appears in a string substr_replace( string,inserted characters,start,length ) Replace part of the string with another charactertrim(string,which characters (optional)) Remove blank characters and other characters trim on both sides of the string ucfirst(string) Convert the first character of the string to uppercase ucwords(string) Convert each character of the string Convert the first character to uppercase sha1( ) Calculate the SHA-1 hash of the string sha1_file(file) Calculate the SHA hash of the file sprintf(How to format the variables) Write the formatted string into a variable str_getcsv(string, delimiter , Surround character, escape character) Parse the CSV string into an array str_ireplace(Find value, replace value) Replace some characters in the string (case insensitive) Sensitive) Str_pad (# String, Length ##) Fill the string into a new length string, number # #) Repeat the string a specified number of times Find value, replace value) Replace some characters of the string (case sensitive) (string.length) Split the string into an array string) Calculate the length of the word in the string string,search,before_search) Find the first occurrence of a string in another string strstr() content,array) Return a string composed of array elements US [ ɪmˈploʊd] string, defined character ) Remove the blank characters on the left side of the string or Other characters string,array(optional) Parses the query string into a variable string,find,start ) Returns the position of the first occurrence of a string in another string (case insensitive) search, searched string) Finds a string in another string The position of the first occurrence in (insensitive to case) string, the character to be found) Returns The position of the first occurrence of a string in another string (case insensitive) string, the character to be searched for) Find the last string in another string One occurrence of string,search character) Find the last occurrence of a string in another string (case insensitive) strrpos(string, the character to be searched for) Find the last occurrence of a string in another string (case insensitive) addcslashes(string, Range) Returns a string with a backslash added before the specified character addslashes(string) Returns a string with a backslash added before the predefined character chr( ASCII value. ) Returns characters from the specified ASCII code value chunk_split(string,length,end) Splits the string into a series of smaller parts count_chars() Return the character information used in the string echo(strings) Output one or more strings explode() Expand the characters into an array #Date date_default_timezone_get() Returns the default time zone used by all Date/Time functions date_default_timezone_set() Sets the default time zone used by all Date/Time functions date( ) Format local date and time time() Returns the Unix timestamp of the current time round() use use using that that with down to the same over as down as down as being being being being being being over being be over being over being over being toward being worth before being over being toward be worth toward worth before being worth' be' worth' you'''''' myself's‐' ##max() forward to get the direct value in the array. #is_nan() Determine whether it is a non-numeric value Write Open file is_dir(file) Determine whether the file is in the same directory is_file(file) Determine whether the file is a regular file mkdir( ) # rename(file) From a named file or directory rmdir ( Directory ) out out out out off out out out out out out through out through out through out using ‘’’’’ ’’’’ out out out out through out through out through'''‐'''‐''‐''‐through through to be filesize(filename) Returns the file size fopen( ) Opens a file or URL fputs(file,string,length) The content is written to an open file Alias of fwrite() fread(file,length) Read the open filefseek(file, new position) Position in the open file copy(file,to_file) Copy the file to the destination dirname(path path) Return the directory name part of the path fclose(file) Close the open file fgetc(file) Returns characters from an open file fgetcsv(file) Parses a line from an open file, validating CSV fields fgets(file) open Return a line from the file fgetss(file) Return a line from the open file and filter out HTML and PHP file(path) Read the file into the array file_exists( file) off out off out. ## Directory Directory #) Turn off the recorded handle # Getcwd ( Directory ##11 OpenDir ( PATH) Open the directory handle Readdir ( Dir_handle available ) The condition of the directory handle scandir(directory) Returns an array of files and directories in the specified directory Related recommendations: Search performance test of php function
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