php built in functions

[PHP] a simple and brilliant way to get the length of a Chinese string. When writing the form verification class of the framework tonight, you need to determine whether the length of a string is within the specified range. Naturally, you think of

Fatalerror: Calltoundefinedfunction. Fatal errors of common PHP errors (1) ---- undefined function I. Error Type: PHP fatal error Errortype: PHPFatalerrorFatalerror: Calltoundefinedfunction (a) in (B) on PHP common error handling fatal error (1) ----

Because PHP is an open language, it also leads to the lack of strong and authoritative support for the development environment. Here are some good editing tools, hoping to help you develop PHP programs. Dreamweaver started from MX and DW began to

Some performance issues often need to be considered during php Development. the following is a summary. 1. if a method can be static, it will be declared as static. The speed can be increased to 4 times. 2. echo is faster than print. 3. use multiple

PHP read/write Cookie efficiency analysis and performance optimization. Understand the execution time and efficiency of PHP read/write cookies, understand the impact of PHP read/write cookies on performance, and use PHP to read/write cookies

This article mainly introduces the php method for getting system variables. The example summarizes how to use get_defined_vars, get_object_vars, phpinfo, and phpversion to obtain system information, for more information about how to use php to

Php: php array. Php is used to obtain the value of the first array element in an array element. The php array example in this article describes how php can obtain the value of the first array element in an array element. We will share with you how

50 PHP program performance optimization methods. 1. replace double quotation marks with single quotes to include strings, which is faster. Because PHP will search for variables in strings enclosed by double quotes, but not in single quotes. note:

What is a smarty plugin?Follow the original system rules, can call system functions and so on;Strong portability, no impact on the original system;is essentially a function;Smarty Common plug-in types1.functions function Plug-in2.modifiers modifier

Reprinted from: http://www.uedsc.com/micrometer-method.htmlSometimes I need to add a number to every three digits plus a comma, for example, 20000 to 20,000, in order to facilitate the financial reading, so I sorted out the following four ways to

This article provides a detailed analysis of PHP bubble sorting binary search sequence query two-dimensional array sorting algorithm functions. it is important for a friend to refer to the data structure, algorithm + data structure + document =

Use single quotes instead of double quotes to include strings, which is faster. Because PHP will search for variables in strings enclosed by double quotes, but not in single quotes. Note: Only echo can do this, it is a "function" that can treat

This article mainly introduces the usage of the Ctype function in php, analyzes the usage of the Ctype function in detail in the form of an instance, and has some practical value for string detection, for more information about the Ctype function in

Baidu engineers talk about the implementation principle and performance analysis of PHP function (i.) ObjectiveIn any language, a function is the most basic constituent unit. What are the features of PHP functions? How is a function call

In our work, we often need to turn a two-dimensional array into a one-dimensional array. Then we need to loop out, in fact, sometimes we can use a few tips, with the help of PHP built-in functions, but I'm just talking about a simple two-dimensional

Delete php code for arrays and 2D array values. The method is as follows: $ arrarray (); assume that an array with 10 thousand elements contains repeated elements. $ Arrarray_flip (array_flip ($ arr); this allows you to delete duplicate elements.

This article mainly introduces the comparison of the retrieval speed of PHP class member variables in four ways, and analyzes the causes in detail, for more information, see the following four sample codes. what do you think is the sorting speed of

This article provides a detailed analysis of PHP bubble sorting binary search sequence query two-dimensional array sorting algorithm functions. it is important for a friend to refer to the data structure, algorithm + data structure + document =

50 tips for improving PHP execution efficiency by parsing. 50 tips for improving PHP execution efficiency 1. use single quotes instead of double quotes to include strings, which is faster. Because PHP will search for variables in strings enclosed by

The following text: This article mainly introduces the PHP file read and write operation related function Summary, this article summarizes fwrite (), Fread (), fgets (), fgetc (), file (), ReadFile () and other functions of the introduction and use