Array in php
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An array can store multiple values in a single variable. It contains elements that each have a value and key. There are numeric, associative, and multidimensional arrays in PHP. Arrays can be initialized by assigning values, one by one or all at once. Array contents can be accessed and displayed using a loop or by index. Associative arrays use named keys instead of numeric indexes. The size of an array can be found using the count() function.
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![Initializing ArraysNo of ways to initialize the array.For e.g.$ncststu[] = “Sri”; $ncststu[] = “Raja”; $ncststu[] = “Lakshmi”;$ncststu[123] = “Sri”; $ncststu122] = “Raja”; $ncststu[121] = “Lakshmi”;$ncststu = array (“Sri”, “Raja”, “Lakshmi”);to change the indices of the array use => operator.Department of CE/IT](https://image.slidesharecdn.com/arrayinphp-100602013836-phpapp01/85/Array-in-php-6-320.jpg)
![Creating an arrayThere are more ways to create an array in PHP. Maybe the most easiest way to create our color list array is the following:other sollution is to initialise array elements one-by-one as follows:Department of CE/IT$colorList = array("red","green","blue","black","white");$colorList[0] = "red";$colorList[1] = "green";$colorList[2] = "blue";$colorList[3] = "black";$colorList[4] = "white";](https://image.slidesharecdn.com/arrayinphp-100602013836-phpapp01/85/Array-in-php-7-320.jpg)
![Display the array contentIf you want only display one element of the array then you can just write the following code:This code will display the text "red". However you may want to display all elements in the array. You can write a loop and display them like this:Department of CE/ITecho $colorList[0];for ($i=0;$i<=4;$i++){echo $colorList[$i];}](https://image.slidesharecdn.com/arrayinphp-100602013836-phpapp01/85/Array-in-php-8-320.jpg)
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Arrays
ArraysKulachi Hansraj Model School Ashok Vihar An array is a collection of variables of the same type stored in contiguous memory locations that can be accessed using a common name and a single index or subscript. Arrays allow storing and manipulating large number of similar data items efficiently. Some key points about arrays are that they are derived data types, consist of contiguous memory locations, and can store fundamental and user-defined data types.
DSA UNIT II ARRAY AND LIST - notes
DSA UNIT II ARRAY AND LIST - notesswathirajstar The document discusses data structures and algorithms related to arrays and linked lists. It covers key topics like:
1) Operations on arrays like insertion, deletion, and search. It also discusses multidimensional arrays and sparse matrices.
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Arrays
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1. Arrays are fixed-size collections of elements of the same data type that are used to store lists of related data. They can be one-dimensional, two-dimensional, or multi-dimensional.
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Array in php
- 1. ARRAY IN PHPDepartment of CE/IT
- 2. ArrayAn array stores multiple values in one single variable...contains value seteach element has a value, data stored in the element.And has a key by which the element can be referred to.Department of CE/IT
- 4. What is an Array?A variable is a storage area holding a number or text. The problem is, a variable will hold only one value.An array is a special variable, which can store multiple values in one single variable.Department of CE/IT
- 5. Types of ArraysIn PHP, there are three kind of arrays:Numeric array - An array with a numeric indexAssociative array - An array where each ID key is associated with a valueMultidimensional array - An array containing one or more arraysDepartment of CE/IT
- 6. Initializing ArraysNo of ways to initialize the array.For e.g.$ncststu[] = “Sri”; $ncststu[] = “Raja”; $ncststu[] = “Lakshmi”;$ncststu[123] = “Sri”; $ncststu122] = “Raja”; $ncststu[121] = “Lakshmi”;$ncststu = array (“Sri”, “Raja”, “Lakshmi”);to change the indices of the array use => operator.Department of CE/IT
- 7. Creating an arrayThere are more ways to create an array in PHP. Maybe the most easiest way to create our color list array is the following:other sollution is to initialise array elements one-by-one as follows:Department of CE/IT$colorList = array("red","green","blue","black","white");$colorList[0] = "red";$colorList[1] = "green";$colorList[2] = "blue";$colorList[3] = "black";$colorList[4] = "white";
- 8. Display the array contentIf you want only display one element of the array then you can just write the following code:This code will display the text "red". However you may want to display all elements in the array. You can write a loop and display them like this:Department of CE/ITecho $colorList[0];for ($i=0;$i<=4;$i++){echo $colorList[$i];}
- 9. Associative ArraysAn associative array, each ID key is associated with a value.When storing data about specific named values, a numerical array is not always the best way to do it.With associative arrays we can use the values as keys and assign values to them.Department of CE/IT
- 10. ExampleIn this example we use an array to assign ages to the different persons: $ages = array("Peter"=>32, "Quagmire"=>30, "Joe"=>34); Department of CE/IT
- 11. Finding the Size of an Array:To find the size of an array, use the function count().count() takes one argument, which is the array, and returns an integer represents the number of the elements of this array.Department of CE/IT
- 12. The End.Department of CE/IT