SaaS multi-tenant isolation mode For the SaaS model, resource isolation between multiple tenants is a very basic capability. For cost and operational efficiency considerations, SaaS service providers need to build an envir... Read Multi-tenant system architecture design for SaaS
1: echo: the statement is not a function, there is no return value, and multiple variable values can be output without parentheses. Arrays and objects cannot be output, only simple types (such as int, string) can be printed.
2: print: It is a statement not a function, it has a return value of 1, and only one variable can be output without parentheses. Arrays and objects cannot be output, only simple types (such as int, string) can be printed.
3: print_r: It is a function that can print composite types, such as: stirng, int, float, array, object, etc. When outputting array, it will be represented by a structure, and print_r can be used to make print_r return without output The processed value of print_r
4: printf: It is a function with a return value, the return value is the length of the printed content , and the text is formatted and output (see C language)
5: sprintf: It is a function, similar to printf, but instead of printing, it returns the formatted text (this function writes the formatted string into a variable instead of outputting it), the others are the same as printf.
6: var_dump(): Function, output variable content, type or string content, type, length. Often used for debugging.
// 1 list($a, $b) = array($b, $a); // 2 $a = $a . $b; $b = strlen($b); $b = substr ($a, 0, (strlen($a) – $b)); $a = substr ($a, strlen($b)); // 3 (Must use a character that cannot appear in both strings as a separato...
What are common PHP array functions? (The role of array_merge and in_array)What are the array functions starting with array_ in PHP, and how to use them (at least 6)? 1. Array traversal function list(); // It is not a real...