Php forced type conversion?

Php forced type conversion? 1. Why is the result of a string forcibly converted to an integer: 0?
2. can any type be converted to an array?
3. can any type be converted to an object?

Reply to discussion (solution)

1. when the string is converted to a numeric value, convert the left-side numeric string
2. 3. yes

1. when the string is converted to a numeric value, convert the left-side numeric string
2. 3. yes

Not clear!

Echo (int) 'abc'; // 0
Echo (int) '3abcd'; // 3
Echo (int) '-5abcd'; //-5

You should check the php Manual

You should check the php Manual

What is the description in the php manual?

Convert string to numeric value