What is the principle of string and number operations in php?

The principle of string and number operations in php is: 1. When a string participates in the budget, the system will automatically convert the string type into a numeric type; 2. When there are no numbers or numbers after the string, When participating in the operation, it will be converted into the value "0"; 3. If there is a number in front of the string, the string will be converted into the number when participating in the operation.

The principle of string and number operations in php is:

1. First of all, emphasize: the " " sign in php It is used as an operation, and the operation result must be a numerical value, not like the " " sign used for splicing in JS.

2. Secondly: when a string participates in the budget, the system will automatically convert the string type into a numeric type; when the string type is converted into a numeric type, its value mainly depends on whether there are numbers in front of the string.

• When there are no numbers or there are numbers after the string (such as: $x="abc"), it will be converted into the value "0" when participating in the operation;

• When there is a number in front of the string (such as: $x="1.5abc"), the string will be converted into the number when participating in the operation ;

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