PHP Cookbook

Table of contents: Preface 1. Strings 1.1 Accessing Substrings 1.2 Replacing Substrings 1.3 Processing a String One Character at a Time 1.4 Reversing a String by Word or Character 1.5 Expanding and Compressing Tabs 1.6 Controlling Case 1.7 Interpolating Functions and Expressions Within Strings 1.8 Trimming Blanks from a String 1.9 Parsing Comma-Separated Data 1.10 Parsing Fixed-Width Delimited Data 1.11 Taking Strings Apart 1.12 Wrapping Text at a Certain Line Length 1.13 Storing Binary Data in Strings 2. Numbers 2.1 Checking Whether a String Contains a Valid Number 2.2 Comparing Floating-Point Numbers 2.3 Rounding Floating-Point Numbers 2.4 Operating on a Series of Integers 2.5 Generating Random Numbers Within a Range 2.6 Generating Biased Random Numbers 2.7 Taking Logarithms 2.8 Calculating Exponents 2.9 Formatting Numbers 2.10 Printing Correct Plurals 2.11 Calculating Trigonometric Functions 2.12 Doing Trigonometry in Degrees, not Radians 2.13 Handling Very Large or Very Small Numbers 2.14 Converting Between Bases 2.15 Calculating Using Numbers in Bases Other Than Decimal 3. Dates and Times 3.1 Finding the Current Date and Time 3.2 Converting Time and Date Parts to an Epoch Timestamp 3.3 Converting an Epoch Timestamp to Time and Date Parts 3.4 Printing a Date or Time in a Specified Format 3.5 Finding the Difference of Two Dates 3.6 Finding the Difference of Two Dates with Julian Days 3.7 Finding the Day in a Week, Month, Year, or the Week Number in a Year 3.8 Validating a Date 3.9 Parsing Dates and Times from Strings 3.10 Adding to or Subtracting from a Date 3.11 Calculating Time with Time Zones 3.12 Accounting for Daylight Saving Time 3.13 Generating a High-Precision Time 3.14 Generating Time Ranges 3.15 Using Non-Gregorian Calendars 3.16 Program: Calendar 4. Arrays 4.1 Specifying an Array Not Beginning at Element 0 4.2 Storing Multiple Elements per Key in an Array 4.3 Initializing an Array to a Range of Integers 4.4 Iterating Through an Array 4.5 Deleting Elements from an Array 4.6 Changing Array Size 4.7 Appending One Array to Another 4.8 Turning an Array into a String 4.9 Printing an Array with Commas 4.10 Checking if a Key Is in an Array 4.11 Checking if an Element Is in an Array 4.12 Finding the Position of an Element in an Array 4.13 Finding Elements That Pass a Certain Test 4.14 Finding the Largest or Smallest Valued Element in an Array 4.15 Reversing an Array 4.16 Sorting an Array 4.17 Sorting an Array by a Computable Field 4.18 Sorting Multiple Arrays 4.19 Sorting an Array Using a Method Instead of a Function 4.20 Randomizing an Array 4.21 Shuffling a Deck of Cards 4.22 Removing Duplicate Elements from an Array 4.23 Finding the Union, Intersection, or Difference of Two Arrays 4.24 Finding All Element Combinations of an Array 4.25 Finding All Permutations of an Array 4.26 Program: Printing an Array in a Horizontally Columned HTML Table 5. Variables 5.1 Avoiding == Versus = Confusion 5.2 Establishing a Default Value 5.3 Exchanging Valu