Core Language & Types interview questions

1. A.PHP's automatic conversion of a value from one scalar type to another depending on the operator or context in which the value is used
2. B.a per-file declare statement that turns off coercion of scalar arguments so a mismatched type throws a TypeError instead of being silently converted
3. C.a three-way comparison written as less-than equals greater-than that returns -1, 0, or 1 depending on whether the left side is smaller, equal to, or larger than the right
4. D.compares both value and type, returning true only when operands match without any coercion, written as a triple equals sign

Answer + AI explanation with Pro

1. A.Type juggling
2. B.Scalar type declaration
3. C.Null coalescing operator
4. D.Strict types directive

Answer + AI explanation with Pro

1. A.Type juggling — PHP's automatic conversion of a value from one scalar type to another depending on the operator or context in which the value is used
2. B.Type juggling — compares two operands for equal value after type coercion, written as a double equals sign
3. C.Type juggling — a three-way comparison written as less-than equals greater-than that returns -1, 0, or 1 depending on whether the left side is smaller, equal to, or larger than the right
4. D.Type juggling — returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices

Answer + AI explanation with Pro

1. A.a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value
2. B.the version-8 fix where comparing a number with a non-numeric string now casts the number to string rather than the string to zero, so 0 equals the word foo is finally false
3. C.compares both value and type, returning true only when operands match without any coercion, written as a triple equals sign
4. D.returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices

Answer + AI explanation with Pro

1. A.Strict types directive
2. B.Identical operator
3. C.Numeric string comparison change in PHP 8
4. D.Scalar type declaration

Answer + AI explanation with Pro

1. A.Identical operator — PHP's automatic conversion of a value from one scalar type to another depending on the operator or context in which the value is used
2. B.Identical operator — compares two operands for equal value after type coercion, written as a double equals sign
3. C.Identical operator — a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value
4. D.Identical operator — compares both value and type, returning true only when operands match without any coercion, written as a triple equals sign

Answer + AI explanation with Pro

1. A.a per-file declare statement that turns off coercion of scalar arguments so a mismatched type throws a TypeError instead of being silently converted
2. B.a three-way comparison written as less-than equals greater-than that returns -1, 0, or 1 depending on whether the left side is smaller, equal to, or larger than the right
3. C.returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices
4. D.compares two operands for equal value after type coercion, written as a double equals sign

Answer + AI explanation with Pro

1. A.Identical operator
2. B.Scalar type declaration
3. C.Loose equality operator
4. D.Strict types directive

Answer + AI explanation with Pro

1. A.Loose equality operator — PHP's automatic conversion of a value from one scalar type to another depending on the operator or context in which the value is used
2. B.Loose equality operator — compares two operands for equal value after type coercion, written as a double equals sign
3. C.Loose equality operator — compares both value and type, returning true only when operands match without any coercion, written as a triple equals sign
4. D.Loose equality operator — a per-file declare statement that turns off coercion of scalar arguments so a mismatched type throws a TypeError instead of being silently converted

Answer + AI explanation with Pro

1. A.the version-8 fix where comparing a number with a non-numeric string now casts the number to string rather than the string to zero, so 0 equals the word foo is finally false
2. B.returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices
3. C.compares both value and type, returning true only when operands match without any coercion, written as a triple equals sign
4. D.PHP's automatic conversion of a value from one scalar type to another depending on the operator or context in which the value is used

Answer + AI explanation with Pro

1. A.Strict types directive
2. B.Type juggling
3. C.Numeric string comparison change in PHP 8
4. D.Null coalescing operator

Answer + AI explanation with Pro

1. A.Null coalescing operator — returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices
2. B.Null coalescing operator — a three-way comparison written as less-than equals greater-than that returns -1, 0, or 1 depending on whether the left side is smaller, equal to, or larger than the right
3. C.Null coalescing operator — a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value
4. D.Null coalescing operator — compares two operands for equal value after type coercion, written as a double equals sign

Answer + AI explanation with Pro

1. A.a per-file declare statement that turns off coercion of scalar arguments so a mismatched type throws a TypeError instead of being silently converted
2. B.a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value
3. C.compares both value and type, returning true only when operands match without any coercion, written as a triple equals sign
4. D.a three-way comparison written as less-than equals greater-than that returns -1, 0, or 1 depending on whether the left side is smaller, equal to, or larger than the right

Answer + AI explanation with Pro

1. A.Strict types directive
2. B.Spaceship operator
3. C.Identical operator
4. D.Numeric string comparison change in PHP 8

Answer + AI explanation with Pro

1. A.Spaceship operator — compares two operands for equal value after type coercion, written as a double equals sign
2. B.Spaceship operator — a three-way comparison written as less-than equals greater-than that returns -1, 0, or 1 depending on whether the left side is smaller, equal to, or larger than the right
3. C.Spaceship operator — returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices
4. D.Spaceship operator — a per-file declare statement that turns off coercion of scalar arguments so a mismatched type throws a TypeError instead of being silently converted

Answer + AI explanation with Pro

1. A.returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices
2. B.the version-8 fix where comparing a number with a non-numeric string now casts the number to string rather than the string to zero, so 0 equals the word foo is finally false
3. C.PHP's automatic conversion of a value from one scalar type to another depending on the operator or context in which the value is used
4. D.a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value

Answer + AI explanation with Pro

1. A.Null coalescing operator
2. B.Identical operator
3. C.Scalar type declaration
4. D.Numeric string comparison change in PHP 8

Answer + AI explanation with Pro

1. A.Scalar type declaration — returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices
2. B.Scalar type declaration — a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value
3. C.Scalar type declaration — compares both value and type, returning true only when operands match without any coercion, written as a triple equals sign
4. D.Scalar type declaration — the version-8 fix where comparing a number with a non-numeric string now casts the number to string rather than the string to zero, so 0 equals the word foo is finally false

Answer + AI explanation with Pro

1. A.a per-file declare statement that turns off coercion of scalar arguments so a mismatched type throws a TypeError instead of being silently converted
2. B.compares two operands for equal value after type coercion, written as a double equals sign
3. C.returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices
4. D.a three-way comparison written as less-than equals greater-than that returns -1, 0, or 1 depending on whether the left side is smaller, equal to, or larger than the right

Answer + AI explanation with Pro

1. A.Loose equality operator
2. B.Scalar type declaration
3. C.Identical operator
4. D.Strict types directive

Answer + AI explanation with Pro

1. A.Strict types directive — a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value
2. B.Strict types directive — PHP's automatic conversion of a value from one scalar type to another depending on the operator or context in which the value is used
3. C.Strict types directive — a per-file declare statement that turns off coercion of scalar arguments so a mismatched type throws a TypeError instead of being silently converted
4. D.Strict types directive — returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices

Answer + AI explanation with Pro

1. A.returns its left operand when that operand exists and is not null, otherwise returns the right operand, and suppresses undefined-variable notices
2. B.the version-8 fix where comparing a number with a non-numeric string now casts the number to string rather than the string to zero, so 0 equals the word foo is finally false
3. C.a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value
4. D.a per-file declare statement that turns off coercion of scalar arguments so a mismatched type throws a TypeError instead of being silently converted

Answer + AI explanation with Pro

1. A.Scalar type declaration
2. B.Numeric string comparison change in PHP 8
3. C.Type juggling
4. D.Null coalescing operator

Answer + AI explanation with Pro

1. A.Numeric string comparison change in PHP 8 — the version-8 fix where comparing a number with a non-numeric string now casts the number to string rather than the string to zero, so 0 equals the word foo is finally false
2. B.Numeric string comparison change in PHP 8 — compares two operands for equal value after type coercion, written as a double equals sign
3. C.Numeric string comparison change in PHP 8 — PHP's automatic conversion of a value from one scalar type to another depending on the operator or context in which the value is used
4. D.Numeric string comparison change in PHP 8 — a hint such as int, float, string, or bool placed on a function parameter or return so the engine validates or coerces the passed value

Answer + AI explanation with Pro