Welcome to PHP Questions
Here we have a range of common PHP related questions and answers. If you want to know how to do something in PHP but aren't sure how, then just view the questions here and if you can't find the answer, Ask A Question.Arrays
How can I check if a value is already in an array?How can I create an array of numbers easily?
How can I create an array of the letters of the alphabet?
How can I display values in a two dimensional array?
How can I easily view all members of an array?
How can I loop through the members of an array?
How can I mix up the order of values in an array?
How can I reset an array in PHP?
How can I reverse sort an array keeping the correlation between the index and value?
How can I sort an array keeping the correlation between the index and value?
How do I add to the beginning of an array and find the number of elements in it?
How do I add to the end of an array and know how large the array is?
How do I check if a variable is of array type?
How do I count the number of times a value appears in an array?
How do I find out if a value is already in an array?
How do I find the size of an array?
How do I pick a random value from an array?
How do I remove an element from an array without changing the index values for the rest of the array?
How do I remove and view the last element of an array?
How do I remove the first element from an array?
How do I return all the values in an array?
How do I reverse sort an array by key?
How do I reverse sort the members of an array?
How do I reverse the order of the elements in an array?
How do I sort alphanumeric array data correctly?
How do I sort an array by key?
How do I sort the members of an array by value?
How do I turn an array into a string?
How do I write my own sort function?
How do you remove duplicate values from an array?
I am not interested in the values in the arrays, how can I discard them?
I want to invert my array, can I do this?
Files
How do I open a file to write content to?Forms
How can I access information sent through GET on a form?How can I access information sent through POST on a form?
How can I check a value entered in a field on my form is a number?
How can I check that a data value is alphanumeric?
How do I check for an empty field in a form?
How do I check that a valid email address is entered?
How do I email the contents of a form to me?
How do I escape data that is going into a database?
How do I know if magic quotes is switched on?
How do I make a website field mandatory?
How do I remove escape characters from data?
How do I remove HTML tags from a string?
What are magic quotes?
Functions
How do I get a variable in a function to retain its value between calls?How do I make a variable from outside a function work in that function?
How do I return a value from a function?
What is a function?
What is a static variable within a function?
Images
How can I add text to an image?How can I find the colour of a pixel of an image?
How can I find the width and height of an image resource?
How can I rotate an image?
Mysql
How do I access the current time with mysql?How do I connect to mySQL from PHP?
How do I delete a row from a table?
How do I find second highest value from a table?
How do I find the ID of a new row added to a table?
How do I find the longest value in my mysql table?
How do I find the number of rows affected by a query?
How do I find the number of rows in a result set?
How do I group the results of a mysql query?
How do I include a conditional in my mysql query?
How do I insert the date into my table?
How do I limit the number of rows returned?
How do I order the results of my query?
How do I return a random row from the database?
How do I return the date with mySQL?
How do I set a default value for ENUM fields in PHP?
How do I update the contents of a table row?
Numbers
How do I force a value to be treated as a number?How do I format a number with commas like a monetary value?
How do I generate a random number?
How do I round down a number?
How do I round up a number?
How do I work out the remainder of a division?
Other
Can I include Javascript in my PHP code?Can I spellcheck my text using PHP?
Can PHP create PDF files for me?
How can I add branching logic to my PHP code?
How can I stop my PHP script timing out?
How do I add comments to my PHP script?
How do I check if a date entered exists?
How do I define a constant in PHP?
How do I find out about my PHP installation?
How do I find the timestamp for a particular date?
How do you get an array of the date and time?
I have lots of if else logic - is there another option?
What is a constant in PHP?
What is the difference between the while and do while loops?
Strings
How can I remove spaces from around a string value?How can I remove trailing space from a string?
How can I repeat a string variable several times?
How do I add commas easily to a string of numbers?
How do I calculate the MD5 hash of a string?
How do I calculate the metaphone of a string?
How do I check if a string contains HTML?
How do I convert characters to HTML entities using PHP?